First Report of Twig Canker on Peach Caused by Phomopsis amygdali in China

During May and June of 2009, canker and twig dieback were observed with 30 to 40% incidence in trees in one peach orchard in Nanhui of Shanghai (cv. YuLu juicy peach) and one orchard (cv. JingXiu yellow peach) in Jiaxin of Zhejiang Province, China. Cankers were generally centrally positioned on the nodes at the base of shoots with sunken, reddish brown/tan-to-silver symptoms. Blight was also observed on a few shoots (1). Five samples were collected from each orchard and isolations were conducted on potato sucrose agar (PSA). Ten isolates were obtained and all had white mycelia on PSA. Black pycnidia, formed in culture, produced two types of conidia: hyaline, fusiform alpha conidia and hyaline, string-like beta conidia. Alpha conidia varied from 5.0 to 6.3 × 1.5 to 2.5 μm and beta conidia ranged from 20 to 25 × 1.2 to 1.5 μm. Morphological characteristics suggested the identity of the fungal isolates to be Phomopsis amygdali. To confirm pathogenicity, an inoculum suspension was made from one isolate (10⁶ conidia/ml) and was sprayed until runoff onto five twigs with buds. Inoculated twigs were maintained at 26°C and 100% relative humidity in a growth chamber with a 12-h period of fluorescent light daily. Twigs inoculated with sterilized water were included as noninoculated controls. After 4 days, dark brown lesions appeared around buds on inoculated twigs. No symptoms were observed on the control twigs. Constriction cankers were reproduced and P. amygdali was reisolated from the lesions. To confirm the identity of the pathogen, total genomic DNA was extracted with the cetyltrimethylammoniumbromide (CTAB) method from the mycelia of two isolates from YuLu juicy peach and Jinxiu yellow peach (2). PCR was performed with universal primers ITS1 (5'-TCCGTAGGTGAACCTGCGG-3') and ITS4 (5'-TCCTCCGCTTATTGATATGC-3') to amplify a DNA fragment of approximately 550 bp. The PCR products were purified and sequenced in both directions (Sangon Biotech (Shanghai) Co., Ltd., China). The sequences (GenBank Accession Nos. HQ632013 and HQ632014) shared 98.9% identity with each other (MegAlign software; DNASTAR, Madison, WI). A comparison of these two sequences with those in GenBank showed that the sequences had the highest nucleotide similarity (99%) with P. amygdali isolate FAU1052 from peach in the southeastern United States (Accession No. AF102998). To our knowledge, this is the first report of P. amygdali causing twig canker on peach in China and will provide useful information for developing effective control strategies. References: (1) D. F. Farr et al. Mycologia 91:1008, 1999. (2) M. A. Saghai-Maroof et al. Proc. Natl. Acad. Sci. USA. 81:8014, 1984.

Critical magnetic transition in TbNi2Mn--magnetization and Mössbauer spectroscopy

The structural and magnetic properties of the TbNi(2)Mn(x) series (0.9 ≤ x ≤ 1.10) have been investigated using x-ray diffraction, field- and temperature-dependent AC magnetic susceptibility, DC magnetization (5-340 K; 0-5 T) and (57)Fe Mössbauer spectroscopy (5-300 K). TbNi(2)Mn(x) crystallizes in the MgCu(2)-type structure (space group Fd3m). The additional contributions to the magnetic energy terms from transition-metal-transition-metal interactions (T-T) and rare-earth-transition-metal interactions (R-T) in RNi(2)Mn compounds contribute to their increased magnetic ordering temperatures compared with RNi(2) and RMn(2). Both the lattice constant a and the Curie temperature T(C) exhibit maximal values at the x = 1 composition indicating strong magnetostructural coupling. Analyses of the AC magnetic susceptibility and DC magnetization data of TbNi(2)Mn around the Curie temperature T(C) = 147 K confirm that the magnetic transition is second order with critical exponents β = 0.77 ± 0.12, γ = 1.09 ± 0.07 and δ = 2.51 ± 0.06. These exponents establish that the magnetic interactions in TbNi(2)Mn are long range despite mixed occupancies of Tb and Mn atoms at the 8a site and vacancies. The magnetic entropy - ΔS(M) around T(C) is proportional to (μ(0)H/T(C))(2/3) in agreement with the critical magnetic analyses. The Mössbauer spectra above T(C) are fitted by two sub-spectra in agreement with refinement of the x-ray data while below T(C) three sub-spectra are required to represent the three inequivalent local magnetic environments.

First Report of Tomato yellow leaf curl virus Infecting Cowpea in China

Tomato yellow leaf curl virus (TYLCV) is a devastating pathogen of tomato that causes significant yield losses in many tropical and subtropical regions (1). In China, this virus was first found in 2006 on tomato in Shanghai (2). In October 2008, chlorotic yellow leaves of cowpea (Vigna sinensis) were observed in Qingpu, Shanghai, China with 15 to 20% incidence in plants in high tunnels. Large populations of whiteflies were observed in association with the diseased cowpea. The disease agent was transmitted to cowpea (and tomato) by whiteflies, which resulted in chlorotic yellow leaves on cowpea (yellow leaf curl symptoms on tomato) that were identical to those observed in the field. On the basis of the suspected insect vector, symptomology, and severe epidemics of tomato yellow leaf curl disease (TYLCD) in Shanghai in recent years, Tomato yellow leaf curl virus was suspected as the causal agent. Total DNA was extracted from four symptomatic cowpea samples. PCR was performed with specific primers V416 (5'-CAAGGCACAAACAAGCGACG-3') and C1287 (5'-CTCAACTTCCGAATTTGGACGAC-3') to amplify a 872-bp DNA fragment of the viral coat protein (CP) gene and an amplicon of the expected size was obtained in all four samples but not from healthy leaf samples. The PCR products were sequenced and the sequences were identical among samples. Primers TYLCV-F (5'-CAGGAGGCAGCCAAGTATGAG-3') and TYLCV-R (5'-ACTAATGCCTGTTCYTTCATTCC-3') (Y = C or T/U) were designed on the basis of the sequence (Accession No. HM804856) and reported (Accession No. FM163463) CP gene to amplify the full-length viral DNA of cowpea isolate (CN:SH:Cowpea:08). The sequence was determined to be 2,781 nucleotides long (Accession No. GU434143). A comparison of the sequence with those in GenBank shows that the cowpea isolate has the highest nucleotide sequence identity (99%) with TYLCV isolate XH2 from tomato in Xinghua, Jiangsu, China (Accession No. GU111505). To our knowledge, this is the first report of TYLCV infecting cowpea in China and also the first report in the world. References: (1) H. Czosnek and H. Laterrot. Arch. Virol. 142:1391, 1997. (2) J. B. Wu et al. Plant Dis. 90:1359, 2006.

First Report of Cucurbit chlorotic yellows virus Infecting Melon in China

In October 2007, symptoms of chlorosis on the upper leaves and a bright yellow color on the lower leaves were observed sporadically on hami melon (Cucumis melo cv. Xuelihong) in a high tunnel in Nanhui of Shanghai, China. Disease progresses from initial mottling of leaves into leaves that are completely yellow with the veins remaining green. The oldest leaves develop symptoms first, so these leaves have a pronounced even yellow color. In October 2009, these symptoms were found in all melons produced in the suburbs of Shanghai. These symptoms were similar to those caused by Cucurbit yellow stunting disorder virus (CYSDV) and Cucurbit chlorotic yellows virus (CCYV) (1-3). Twelve samples from symptomatic melons were collected in the Jiading, Nanhui, Fengxian, and Chongming districts of Shanghai for virus diagnosis. Large populations of whiteflies were observed in association with the diseased cucurbit crops. Total RNA was extracted with Trizol reagents (Invitrogen, Carlsbad, CA). We used random primers (9-mer) for reverse transcription-PCR. Extracts were for CYSDV using specific primers CYSDV-CP-F (5'-ATGGCGAGTTCGAGTGAGAA-3') and CYSDV-CP-R (5'-TCAATTACCACAGCCACCTG-3') to amplify a 756-bp fragment of coat protein gene and CCYV using specific primers CCYV-HSP-F1 (5'-TGCGTATGTCAATGGTGTTATG-3') and CCYV-HSP-R1 (5'-ATCCTTCGCAGTGAAAAACC-3') to amplify a 462-bp fragment of the HSP gene (1). CYSDV was not found in all samples. The expected 462-bp target fragment of CCYV was obtained in all samples but not from any of the healthy controls. All the 462-bp PCR products were cloned to pGEM-T vector (Promega, Madison, WI) and sequenced. All sequences obtained were homologous. A comparison of the submitted sequence (GenBank Accession No. HQ148667) with those in GenBank showed that the sequence had 100% nucleotide identity to the Hsp70h sequences of (CCYV) isolates from Japan (Accession Nos. AB523789 and AB457591) (1,4), Taiwan (Accession No. HM120250) (2), and mainland of China (Accession Nos. GU721105, GU721108, and GU721110). CCYV is a new member of the genus Crinivirus, first discovered in Japan in 2004 (4) and reported in Taiwan in 2009 (2). To our knowledge, this is the first report of CCYV on melon in China. References: (1) Y. Gyoutoku et al. Jpn. J. Phytopathol. 75:109, 2009. (2) L.-H. Huang et al. Plant Dis. 94:1168, 2010. (3) L. Z. Liu et al. Plant Dis.94:485, 2010. (4) M. Okuda et al. Phytopathology 100:560, 2010.

A truncated retrotransposon disrupts the GRM1 coding sequence in Coton de Tulear dogs with Bandera's neonatal ataxia

BACKGROUND

Bandera's neonatal ataxia (BNAt) is an autosomal recessive cerebellar ataxia that affects members of the Coton de Tulear dog breed.

OBJECTIVE

To identify the mutation that causes BNAt.

ANIMALS

The study involved DNA from 112 Cotons de Tulear (including 15 puppies with signs of BNAt) and 87 DNA samples from dogs of 12 other breeds.

METHODS

The BNAt locus was mapped with a genome-wide association study (GWAS). The coding exons of positional candidate gene GRM1, which encodes metabotropic glutamate receptor 1, were polymerase chain reaction (PCR)-amplified and resequenced. A 3-primer PCR assay was used to genotype individual dogs for a truncated retrotransposon inserted into exon 8 of GRM1.

RESULTS

The GWAS indicated that the BNAt locus was in a canine chromosome 1 region that contained candidate gene GRM1. Resequencing this gene from BNAt-affected puppies indicated that exon 8 was interrupted by the insertion of a 5'-truncated retrotransposon. All 15 BNAt-affected puppies were homozygous for the insert, whereas all other Cotons de Tulear were heterozygotes (n = 43) or homozygous (n = 54) for the ancestral allele. None of the 87 dogs from 12 other breeds had the insertion allele.

CONCLUSIONS AND CLINICAL IMPORTANCE

BNAt is caused by a retrotransposon inserted into exon 8 of GRM1. A DNA test for the GRM1 retrotransposon insert can be used for genetic counseling and to confirm the diagnosis of BNAt.

Stem cells and hepatic cirrhosis

Hepatic cirrhosis is defined as the histological development of regenerative nodules surrounded by fibrous bands in response to chronic liver injury, which leads to portal hypertension and end-stage liver disease. The majority of patients with hepatic cirrhosis die from life-threatening complications at early age. Liver transplantation has been the most effective treatment for patients with hepatic cirrhosis. Since liver transplantation is critically limited by the shortage of available donor livers, searching for an effective alternative therapy has attracted great interest in preclinical studies. The encouraging advances in stem cell research have paved the way towards the treatment of the end-stage of chronic liver disease. In view of the pathogenic fundamentals of hepatic cirrhosis, stem cell-based treatment should be aimed to complement or replace damaged liver cells and to correct the imbalanced extracellular matrix regeneration/degradation. This review is intended to describe the characteristics and therapeutic potential of various liver repair-related stem cells, including hepatocytes, liver progenitor cells, hematopoietic stem cells, mesenchymal stem cells, embryonic stem cells and induced pluripotent stem cells. Since autologous adult stem cells have the least number of obstacles for clinical application, their potential interventions on cirrhosis are especially illustrated in terms of the cellular and molecular mechanisms of hepatic fibrogenesis.

Molecular alterations of the IDH1 gene in AML: a Children's Oncology Group and Southwest Oncology Group study

Recent whole-genome sequencing efforts led to the identification of IDH1^R132 mutations in AML patients. We studied the prevalence and clinical implications of IDH1 genomic alterations in pediatric and adult AML. Diagnostic DNA from 531 AML patients treated on Children’s Oncology Group trial COG-AAML03P1 (N=257), and Southwest Oncology Group trials SWOG-9031, SWOG-9333, and SWOG-9500 (N=274), were tested for IDH1 mutations. Codon R132 mutations were absent in the pediatric cohort, but were found in 12/274 adult patients (4.4%, 95% CI 2.3-7.5%). IDH1^R132 mutations occurred most commonly in patients with normal karyotype, and those with FLT3/ITD and NPMc mutations. Patients with IDH1^R132 mutations trended towards higher median diagnostic WBC counts (59.2 × 10⁹/L vs. 29.1 × 10⁹/L, P=0.19) than those without mutations, but the two groups did not differ significantly in age, bone marrow blast percentage, overall survival, or relapse-free survival. Eleven patients (2.1%) harbored a novel V71I sequence alteration, which was found to be a germline polymorphism. IDH1 mutations were not detected in pediatric AML, and are uncommon in adult AML.

Magnetic scattering effects in two-band superconductor: the ferromagnetic dopants in MgB₂

This paper demonstrates the magnetic scattering effects on the electron-phonon interaction in two-band superconductors based on the transition-metal-doped MgB₂ to clarify the effects of magnetic dopants on multi-band superconductivity. The phonon properties of polycrystalline Mg(1-x)M(x)B₂ (M = Fe, Ni and Co), with x up to 0.05, were studied, with the investigation based on the normal state Raman spectra, especially the variation of the E(2g) mode. The magnetic scattering effect of Fe is much weaker than that of Mn in MgB₂, while it is stronger than that of Ni. The weak magnetic scattering effects are responsible for the superconducting behaviors of Mg(1 - x)Fe(x)B₂ and Mg(1 - x)Ni(x)B₂. Co shows almost no magnetic scattering effects on the superconductivity, while the depression of the critical temperature, T(c), in Mg(1 - x)Co(x)B₂ is attributed to the phonon behavior and is independent of the ferromagnetic nature of cobalt.

Magnetic phase transitions in Pr(1-x)Lu(x)Mn(2)Ge(2) compounds

The effects of replacing Pr by Lu on the magnetic behaviour and structures of Pr(1-x)Lu(x)Mn(2)Ge(2) (x = 0.2,x = 0.4) have been investigated using x-ray diffraction, Mössbauer spectroscopy, magnetization and neutron diffraction measurements. The substitution of Lu for Pr leads to a decrease in the lattice constants a, c and the unit cell volume V at room temperature with this contraction of the unit cell resulting in modifications of the Pr(1-x)Lu(x)Mn(2)Ge(2) magnetic structures. Four and five magnetic phase transitions-linked primarily with temperature driven changes in the intralayer Mn-Mn separation distances-have been detected within the temperature range 4.5-550 K for Pr(0.8)Lu(0.2)Mn(2)Ge(2) and Pr(0.6)Lu(0.4)Mn(2)Ge(2), respectively, with re-entrant ferromagnetism being detected around T(C)(Pr)∼31 K for Pr(0.6)Lu(0.4)Mn(2)Ge(2). It was found that T(C)(inter) and T(C)(Pr) increase with increasing applied field while T(N)(inter) decreases for Pr(0.6)Lu(0.4)Mn(2)Ge(2), indicating that the canted antiferromagnetic AFmc region contracts with increasing field. The Debye temperatures for Pr(1-x)Lu(x)Mn(2)Ge(2) with x = 0.2 and 0.4 were evaluated as θ(D) = 320 ± 40 K and θ(D) = 400 ± 20 K respectively from the temperature dependence of the average isomer shift. The magnetic structures of both compounds have been determined by means of neutron diffraction measurements over the temperature range 3-300 K with formation of the Fmi magnetic state below T(c/c) = 192 K for Pr(0.8)Lu(0.2)Mn(2)Ge(2) and the occurrence of re-entrant ferromagnetism below T(C)(Pr) = 31 K for Pr(0.6)Lu(0.4)Mn(2)Ge(2) being confirmed.

Determination of milk and blood concentrations of lipopolysaccharide-binding protein in cows with naturally acquired subclinical and clinical mastitis

Blood and milk concentrations of the acute phase protein lipopolysaccharide-binding protein (LBP) were evaluated in cows with naturally occurring mastitis. Blood and milk samples were collected from 101 clinically healthy dairy cows and 17 dairy cows diagnosed with clinical mastitis, and the LBP concentrations of the samples were measured by an ELISA. Concentrations of LBP were greater in the blood and milk of cows with clinical mastitis than in those with healthy quarters. Concentrations of LBP also differed between uninfected and subclinically infected quarters with low somatic cell count. Blood concentrations of LBP in cows with subclinical intramammary infections could not be differentiated from those of cows with all healthy quarters. Together, these data demonstrate that increased blood and milk concentrations of LBP can be detected in dairy cows with naturally acquired intramammary infections that cause clinical mastitis.

Endogenously expressed truncated P2X7 receptor lacking the C-terminus is preferentially upregulated in epithelial cancer cells and fails to mediate ligand-induced pore formation and apoptosis

A truncated naturally occurring variant of the human purinergic receptor P2X7 (P2X7-R) was found in human cancer cervical cells. The novel protein consists of 258 amino acids, and compared to the wild-type P2X7-R it lacks the entire intracellular carboxy terminus, the second transmembrane domain, and the distal third of the extracellular loop. The truncated P2X7-R failed to form pores and mediate apoptosis, and it interacted with the wild-type P2X7-R in a manner suggesting auto-hetero-oligomerization. In contrast to cancer cells the novel truncated P2X7-R was expressed relatively little in normal cervical cells. These data raise the possibility that coexpression of the truncated form could block P2X7 mediated apoptosis and promote uncontrolled growth of cells.

Construction and Characterization of a cDNA Library from Liver Tissue of Chinese Banna Minipig Inbred Line

A xenograft that performs efficient functions is an essential premise for successful xenotransplantation. Our early study indicated that Chinese Banna minipig inbred line (BMI) was an ideal xenograft donor. However, the activities of some proteins synthesized by the BMI liver are different from the human, which could lead to functional disorders in coagulation, fibrinolysis, and anticoagulation after liver xenotransplantation. Therefore, it is important to investigate the genetic background of protein incompatibility and to provide new strategies for gene manipulation. In this study we constructed a cDNA expression library using BMI liver tissue to obtain an understanding of nucleic acid and protein differences between the two species. We extracted total RNA and purified mRNA of the liver tissue from one of the sixteenth inbred generation of BMI/JS 151 substrain. After double-strand cDNA synthesis, we fractionated it on a CHROMA APIN-400 column; ligated the longer than 500bp cDNA into a ZAP Express Vector; and performed a lambda: phage packaging reaction, library amplification, and titer. We randomly picked 12 plaques and tested the length of inserts. The titers of the primary and amplified libraries were 1.0 x 10(6) pfu/mL and 5.0 x 10(9) pfu/mL, respectively. The percentages of recombinants were 97.0% in the primary library and 98.0% in the amplified library. The lengths of most inserts were between 750 bp and 2.0 kb. Thus, we successfully constructed a cDNA expression library from BMI liver tissue. Using the library, we hope to get a full-length cDNA of some important genes and conduct further studies on porcine liver function in xenotransplantation.

Study of hepatic function matching between banna minipig inbred and humans

As a unique inbred pig Banna minipig inbred (BMI) is potentially suitable for pig-to-human xenotransplantation due to its clear genetic background and minor interindividual differences. Previous studies of BMI have focused on immunological barriers between BMI and humans. However, a comparison of liver function between donor animals and humans is an essential premise for successful xenotransplantation. In this study, we investigated routine hepatic functions, protein electrophoresis, and drug metabolism to compare capacity of liver synthesis, metabolism, and drainage between BMI and humans. The results showed no significant differences in the concentrations of albumin and globulin synthesized in the liver (alpha1, alpha2, and beta-globulin). Serum enzyme activities in BMI were higher than those in humans, and levels of total bilirubin and direct-reacting bilirubin of BMI were lower than those of humans. In BMI, the clearance of antipyrine, a widely used model drug to study hepatic drug metabolism, was 16 times greater than that by humans, with a mean residual time of antipyrine in BMI, one-tenth of that in human. These findings suggested that BMI livers are similar to humans in albumin and alpha, beta-globulin synthesis, but stronger in bilirubin elimination, enzyme activity, and drug metabolism. BMI livers may have stronger functions compared with those of humans. No incompatibility was identified in hepatic function between BMI and humans.

Activation of human coagulation system by liver-derived clotting factors of banna minipig inbred line

The liver synthesizes most of the coagulation factors that play a major role in arresting hemorrhage. Matching hepatic coagulation factors is an important premise in successful xenotransplantation. As a unique inbred pig, the Banna minipig inbred (BMI) animals have a huge potential value for pig-to-human xenotransplantation, due to its clear genetic background and tiny interindividual differences. Whether the coagulation factors synthesized by porcine liver can trigger human clotting pathways has not been reported. This study focused on the activities of BMI coagulant factors synthesized exclusively by the liver to activate human clotting pathways. In these experiments we prepared coagulant factors II, V, VII, X, and XII synthesized exclusively by liver from BMI and humans. The factors were used in common correction tests, added to the corresponding factor-deficient human plasma to determine prothrombin times or activated partial thromboplastin time, thereby calculating BMI and human coagulant factor activities. BMI clotting factors XII, VII, and X triggered human intrinsic, extrinsic, and common pathways, respectively. BMI clotting factors II, V, VII, X, and XII activities were 3.2-, 3.7-, 4.7-, 2.9-, and 4.5-fold as potent as those from humans.

Study of renal function matching between banna minipig inbred line and human

Pigs have been thought to be ideal candidates for xenotransplant donors. However besides the immunological barrier, physiological and pharmacokinetic comparabilities of kidney function between donor animals and humans are important factors for successful xenotransplantation. As a unique large inbred animal, Banna Minipig Inbred (BMI) has been reported to be a potential large animal suitable for xenotransplantation. However, its physical and pharmacokinetic compatibilities with humans have not been documented. The purpose of this investigation was to measure renal routine function, glomerular filtration rate (GFR), renal blood flow (ERPF), and drug metabolism to evaluate comparability to humans. The results suggested that the renal function of BMI was similar to that of humans to eliminate nonprotein nitrogenous end products of metabolism. Pharmacokinetics of p-aminohippurate (PAH) and inulin--the most widely used methods to assess ERPF and GFR--showed that BMI showed lower values than humans for GFR, but similar function to humans in ERPF. The pharmacokinetics of cefazolin; a widely used model drug to study kidney drug metabolizing capacity, showed greater overall renal drug elimination of BMI than of humans. These results suggested that BMI did show comparable data to human renal function.

Comparison of methods for the determination of K(L)aO2 for respirometric measurements

The mass transfer coefficient for oxygen in water (K(L)aO2) is an important parameter for respirometric studies. But determination of K(L)aO2 in process conditions is not straightforward, In this paper, two distinct procedures for determining K(L)aO2 in process conditions are outlined and tested. The off-gas method relies on a gas mass balance over a bioreactor while the non-steady state methods rely on analysing DO recovery after perturbation. Various means for inducing perturbation are tested and compared. K(L)aO2 values for a bioreactor are determined by the listed methods. It was found that the off-gas method resulted in the highest K(L)aO2 for the given reactor, while the non-steady state method, whereby perturbation is caused by exogenous activity on acetate, resulted in the lowest K(L)aO2. It is shown that the gas mass balancing technique is robust to unexpected exogenous activity (caused by for example, the oxidation of storage polymers formed or nitrite accumulated), while the non-steady state methods that involve inducing perturbations by exogenous activity appear susceptible to such continued exogenous activity in the DO recovery period.

Capillary electrophoresis-electrospray mass spectrometry for the characterization of high-mannose-type N-glycosylation and differential oxidation in glycoproteins by charge reversal and protease/glycosidase digestion

The characterization of high-mannose-type N-glycosylation by capillary electrophoresis-electrospray mass spectrometry (CE-ESI MS) was described. In addition to the use of a cationic noncovalent capillary coating, strong acidic buffer, and charge reversal to increase the glycoform resolving power, N-glycosidase F (PNGase F) combined with a basic protease and alpha-mannosidase combined with an acidic protease were used to analyze the high-mannose-type N-glycosylation in ribonuclease B (RNase B) and in a novel C-type lectin from the venom of Trimeresurus stejnegeri (TSL). The structures of oligosaccharide, glycosylation sites, and glycoform distributions were determined simultaneously, and the differential oxidation of Met residues in glycopeptides obtained from TSL protease digestion was also characterized successfully by CE-MS/MS. The results showed that the oligosaccharide attached to RNase B has a structure of GlcNAc2Man5 approximately 9, and that attached to TSL has a structure of GlcNAc2Min5 approximately 8. The glycoform distributions in these glycoproteins are quite different, with the GlcNAc2Man5 type predominant in RNase B, and the GlcNAc2Man8 type, in TSL This method may be useful not only for the characterization of glycosylation sites and glycan structures, but also for the determination of the relative abundance of individual glycoforms.