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Shteyer E, Ramm GA, Xu C, White FV, Shepherd RW. Outcome after portoenterostomy in biliary atresia: pivotal role of degree of liver fibrosis and intensity of stellate cell activation. J Pediatr Gastroenterol Nutr 2006; 42:93-9. [PMID: 16385261 DOI: 10.1097/01.mpg.0000189324.80323.a6] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVES Biliary atresia (BA), a congenital idiopathic obliterative cholangiopathy, rapidly leads to liver cirrhosis and liver failure if untreated. A timely Kasai portoenterostomy (KP) variably alters this natural history. We evaluated liver fibrogenesis by the intensity of alpha-smooth-muscle actin (SMA) expression, which is a marker for hepatic stellate cell activation. We hypothesized that liver fibrogenesis as determined by intensity of alpha-SMA is already progressing at the time of KP, is related to age and degree of fibrosis at KP, and predicts outcome after KP. METHODS BA patients at KP (n = 22, age 22-84 days, median 59) had wedge liver biopsies assessed by quantitative morphometry of immunohistochemistry for alpha-SMA expression. Fibrosis was scored by blinded pathologists. Outcome, reflected by conjugated bilirubin concentration 3 months after KP (CBili3m), survival of the native liver, need for liver transplant, or death, were assessed for 2 to 10 years after KP. RESULTS At KP, age, fibrosis score, and alpha-SMA expression were significantly correlated. Moderate-severe fibrosis and intense alpha-SMA expression was observed in 15 of 22 (68%) patients. Severe fibrosis and high alpha-SMA expression were significantly associated with CBili3m greater than 2 g/dL and unfavorable liver survival (>90% of these ultimately underwent liver transplantation or died). Conversely, those with mild fibrosis and low alpha-SMA expression had normal CBili3m and favorable liver survival. CONCLUSION Intense liver fibrogenesis is already established in many cases of BA at the time of KP. Fibrosis scores and intensity of alpha-SMA expression may be predictors of outcome after KP and may indicate those patients who might benefit from trials of potential antifibrotic agents early in the course of BA.
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Mouawad L, Maréchal JD, Perahia D. Internal cavities and ligand passageways in human hemoglobin characterized by molecular dynamics simulations. Biochim Biophys Acta Gen Subj 2005; 1724:385-93. [PMID: 15963643 DOI: 10.1016/j.bbagen.2005.05.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2005] [Revised: 05/11/2005] [Accepted: 05/12/2005] [Indexed: 11/30/2022]
Abstract
Molecular dynamics simulations of the unliganded T state of human hemoglobin showed the existence of a spontaneous, very wide cavity on the distal side of the alpha subunit. This cavity consists of three tunnels spreading from the vicinity of the iron atom (the ligand binding site) to the surface of the subunit, constituting possible passageways for the entrance of the ligand. A fourth passageway was characterized due to the trajectory of water molecules entering or leaving the heme pocket. Analogous passages were observed in the beta subunits. They all appear and disappear dynamically, although some parts of them are more persistent along the trajectories. The most persistent regions within these tunnels correspond to all the xenon docking sites of human cytoglobin and to some of those of sperm whale and horse heart myoglobins and group I truncated hemoglobins.
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Shahabi M, Noori Daloii MR, Langan JE, Rowbottom L, Jahanzad E, Khoshbin E, Taghikhani M, Field JK, Risk JM. An investigation of the tylosis with oesophageal cancer (TOC) locus in Iranian patients with oesophageal squamous cell carcinoma. Int J Oncol 2005; 25:389-95. [PMID: 15254736 DOI: 10.3892/ijo.25.2.389] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Oesophageal cancer is one of the ten leading causes of cancer mortality worldwide. Earlier loss of heterozygosity (or allelic imbalance) studies have implicated regions on chromosomes 3p, 5q, 9p, 13q, 17p, 17q, and 18q in the development of sporadic oesophageal cancer and recent data have linked the familial tylosis with oesophageal cancer (TOC) gene-containing region on chromosome 17q25 with this cancer. We have studied allelic imbalance (AI) at microsatellite markers both closely linked to and distant from the TOC gene locus in 60 sporadic squamous cell oesophageal cancers from Iran and have investigated the most likely candidate gene by mutation analysis in these tumours. Forty-four out of these 60 samples (73%) show allelic imbalance at one or more loci within or adjacent to the TOC minimal region, while the highest incidence of AI was observed at the D17S2244 and D17S2246 loci (almost 70% AI in informative cases), correlating with the TOC minimal region. Analysis of the coding regions of a candidate gene in these tumours failed to show an equivalently high incidence of mutation, although two mutations and one polymorphism were observed. These data support and extend previous observations that the TOC region of chromosome 17q25 may be involved in the aetiology of the sporadic form of oesophageal cancer from a number of different geographical populations and suggest that the causative gene may be epigenetically silenced rather than mutated.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Allelic Imbalance
- Carcinoma, Squamous Cell/genetics
- Carcinoma, Squamous Cell/secondary
- Chromosomes, Human, Pair 17/genetics
- Cytoglobin
- Esophageal Neoplasms/genetics
- Esophageal Neoplasms/pathology
- Exons/genetics
- Female
- Globins
- Humans
- Iran
- Keratoderma, Palmoplantar, Diffuse/complications
- Keratoderma, Palmoplantar, Diffuse/genetics
- Male
- Microsatellite Repeats/genetics
- Middle Aged
- Peroxidases/genetics
- Polymorphism, Single Nucleotide
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Martins JTN, Bordin S, de Albuquerque DM, Saad STO, Costa FF. DNAase I hypersensitive site 3' to the beta-globin gene cluster containing two TAA insertions and a G-->A polymorphism is predominantly associated with the beta+-thalassemia IVS-I-6 (T-->C) mutation. Hemoglobin 2005; 29:85-9. [PMID: 15768560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Analysis of DNA polymorphic sites is an important tool for the detection of gene flow in human evolutionary studies and to study the genetic background for gene mutations. The beta-globin locus contains several single-base restriction fragment length polymorphism (RFLP) sites throughout chromosome 11. In addition to these polymorphic sequence repeats, others are being studied in order to expand our knowledge concerning the role between haplotype-genotype and phenotype associations. Far downstream of the expressed beta-globin genes, there is a hypersensitive site (HS) whose function remains obscure. We sequenced this region in 27 thalassemia patients and found a new pattern in the micro-satellite-like AT-rich region of this site: a new TAA insertion in addition to the one previously described in sickle cell patients with a concomitant polymorphism (G-->A). This new variation was found to be linked to the IVS-I-6 (T-->C) mutation. This polymorphism may be useful for studies concerning genotype and phenotype associations.
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de Sanctis D, Dewilde S, Pesce A, Moens L, Ascenzi P, Hankeln T, Burmester T, Bolognesi M. Mapping protein matrix cavities in human cytoglobin through Xe atom binding. Biochem Biophys Res Commun 2004; 316:1217-21. [PMID: 15044115 DOI: 10.1016/j.bbrc.2004.03.007] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2004] [Indexed: 11/29/2022]
Abstract
Cytoglobin is the fourth recognized globin type, almost ubiquitously distributed in human tissues; its function is still poorly understood. Cytoglobin displays a core region of about 150 residues, structurally related to hemoglobin and myoglobin, and two extra segments, about 20 residues each, at the N- and C-termini. The core region hosts a large apolar cavity, held to provide a ligand diffusion pathway to/from the heme, and/or ligand temporary docking sites. Here we report the crystal structure (2.4A resolution, R-factor 19.1%) of a human cytoglobin mutant bearing the CysB2(38) --> Ser and CysE9(83) --> Ser substitutions (CYGB*), treated under pressurized xenon. Three Xe atoms bind to the heme distal site region of CYGB* mapping the protein matrix apolar cavity. Despite the conserved globin fold, the cavity found in CYGB* is structured differently from those recognized to play a functional role in myoglobin, neuroglobin, truncated hemoglobins, and Cerebratulus lacteus mini-hemoglobin.
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BRANDT JL, CACCESE A, GINSBERG V. Effects of modified human globin in normal human subjects. Exp Biol Med (Maywood) 2004; 77:108-10. [PMID: 14844411 DOI: 10.3181/00379727-77-18694] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Lebensztejn DM. [Contemporary opinions on liver fibrosis pathogenesis]. POLSKI MERKURIUSZ LEKARSKI : ORGAN POLSKIEGO TOWARZYSTWA LEKARSKIEGO 2003; 14:174-6. [PMID: 12728684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
The author presents the selected aspects of liver fibrosis pathogenesis with special regards to the mechanism of hepatic stellate cells activation.
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Wajcman H, Kiger L. [Hemoglobin, from microorganisms to man: a single structural motif, multiple functions]. C R Biol 2002; 325:1159-74. [PMID: 12520866 DOI: 10.1016/s1631-0691(02)01537-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Haemoglobins from unicellular organisms, plants or animals, share a common structure, which results from the folding, around the heme group, of a polypeptide chain made from 6-8 helices. Nowadays, deciphering the genome of several species allows one to draw the evolutionary tree of this protein going back to 1800 millions of years, at a time when oxygen began to accumulate in the atmosphere. This permits to follow the evolution of the ancestral gene and of its product. It is likely that, only in complex multicellular species, transport and storage of oxygen became the main physiological function of this molecule. In addition, in unicellular organisms and small invertebrates, it is likely that the main function of this protein was to protect the organism from the toxic effect of O2, CO and NO*. The very high oxygen affinity of these molecules, leading them to act rather as a scavenger as an oxygen carrier, supports this hypothesis. Haemoglobins from microorganisms, which may probably be the closest vestiges to the ancestral molecules, are divided into three families. The first one is made from flavohaemoglobins, a group of chimerical proteins carrying a globin domain and an oxido-reduction FAD-dependant domain. The second corresponds to truncated haemoglobins, which are hexacoordinated with very high oxygen-affinity molecules, 20-40 residues shorter than classical haemoglobins. The third group is made from bacterial haemoglobins such as that of Vitreoscilla. Some specific structural arrangements in the region surrounding the heme are cause of their high oxygen affinity. In plants, two types of haemoglobins are present (non-symbiotic and symbiotic), that arose from duplication of an ancestral vegetal gene. Non-symbiotic haemoglobins, which are probably the oldest, are scarcely distributed within tissues having high energetic consumption. Conversely, symbiotic haemoglobins (also named leghaemoglobins) are present at a high concentration (mM) mostly in the rhizomes of legumes, where they are involved in nitrogen metabolism. In some species, haemoglobin was proposed to be an oxygen sensor bringing to the organism information to adjust metabolism or biosynthesis to the oxygen requirement. Elsewhere haemoglobin may act as final electron acceptors in oxido-reduction pathways. Evolution of haemoglobin in invertebrates followed a large variety of scenarios. Some surprising functions as sulphide acquisition in invertebrates living near hydrothermal vents, or a role in the phototrophism of worm need to be mentioned. In invertebrates, the size of haemoglobin varies from monomers to giant molecules associating up to 144 subunits, while in vertebrates it is always a tetramer. In some species, several haemoglobins, with completely different structure and function, may coexist. This demonstrates how hazardous may be to extrapolate the function of a protein from only structural data.
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Asahina K, Kawada N, Kristensen DB, Nakatani K, Seki S, Shiokawa M, Tateno C, Obara M, Yoshizato K. Characterization of human stellate cell activation-associated protein and its expression in human liver. BIOCHIMICA ET BIOPHYSICA ACTA 2002; 1577:471-5. [PMID: 12359339 DOI: 10.1016/s0167-4781(02)00477-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This study cloned cDNA of human homologue (hSTAP) of rat stellate cell activation-associated protein (rSTAP). hSTAP gene is on chromosome 17q and is composed of four exons. Various types of cells including hepatic stellate cells expressed hSTAP mRNA. Recombinant hSTAP was a heme protein with the activity of peroxidase. hSTAP can be used as a marker of quiescent stellate cells in human liver.
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Abstract
Alloimmune response induced by foreign histoincompatible alloantigens is a complex phenomenon possessing mechanisms, characteristics to innate and adoptive immune response. It is also modified by various immunregulating exocrine and autocrine factors. Starting the new time period of functional genomics the knowledge of human genes' structure needs a more clear insight not only about the function and contribution of genes but their historical background, origin and importance in the phylogenesis. Comparative immunology comes into focus of interest helping to understand the complexity of immune and alloimmune response. It is almost unbelievable that immune functions as phagocytosis and cytokine production like IL-1 and TNF have already emerged 700 million years ago in starfishes and sponges. Functions--including recruitment of coelomocytes, killing of micro-organisms by lysosome-like enzyme activity, opsonization by complement analogous proteins and oxidative burst function--remained unchanged during phylogenesis and could be found not only in insects but in mammals as well as representatives of innate immunity. The importance of these molecules is reflected in homology of conservative regions. One of the biggest evolutionary steps happened 500 million years ago when fish developed a jaw in the Placoderms species. This fact led to the development of gut associated immune system. The system was the basis to create the genetic material for recombination and mutation to establish variability and diversity of proteins, as immunoglobulins. It is interesting to lean how diversity of immunglobulins in sharks is insured by joining of blocks of V, D, J and C genes, in contrast to humans, where those genes are located on different chromosome regions. These differences are associated with an immediate production of specific immunglobulin or a slower one combined with immunologic memory. Similar development could be found in T cell antigen specific receptors, too. Concerning the establishment of adoptive immunity by emergence of genetic recombination, which allowed the production of a huge diversity of specific antigen binding proteins, another structure developed parallel from the histoglobin molecule. This protein was created to catch peptide particles which split from the proteins originating from microorganisms, viruses or foreign cell compartments. The cave-like groove capturing the different peptides represented a huge variability. These histocompatibility molecules emerged from this ancient structure for more than 300 million years ago. The genetic family responsible for their synthesis became the most complex gene family including many other genes involved in the immune response. The polymorphic character of the histocompatibility protein is responsible for the capture of the relevant peptides fitting best to the allotype-determined groove. In certain species the same function could be filled by different ancient molecules with the same success. Dendritic cells and their importance in differentiation and antigen presentation became in the focus of interest in the last decade. They have lymphoid and myeloid origin, mature and less differentiated subtypes with characteristic CD markers and cytokine profile. Their function and origin from the stem cell subpopulation is an important example how nature influences the development of immunity to the accommodation and survival to the always changing environment. The new molecular techniques will help to get closer to understand the function of genes regulating immune response and modify them.
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Abstract
We have identified a new human hemoglobin that we call histoglobin because it is expressed in a wide array of tissues. Histoglobin shares less than 30% identity with the other human hemoglobins, and the gene contains an intron in an unprecedented location. Spectroscopic and kinetic experiments with recombinant human histoglobin indicate that it is a hexacoordinate hemoglobin with significantly different ligand binding characteristics than the other human hexacoordinate hemoglobin, neuroglobin. In contrast to the very high oxygen affinities displayed by most hexacoordinate hemoglobins, the biophysical characteristics of histoglobin indicate that it could facilitate oxygen transport. The discovery of histoglobin demonstrates that humans, like plants, differentially express multiple hexacoordinate hemoglobins.
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38
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Evans V, Vockler C, Friedlander M, Walsh B, Willcox MD. Lacryglobin in human tears, a potential marker for cancer. Clin Exp Ophthalmol 2001; 29:161-3. [PMID: 11446459 DOI: 10.1046/j.1442-9071.2001.00408.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Lacrygobin has been identified in human tears. This protein has high sequence homology to the mammaglobins, proteins upregulated in breast cancer and in breast cancer metastasis. In order to investigate the utility of tear screening for cancer tear samples were collected from patients with different types of cancer and compared to controls. Tear samples were taken from five controls and eight breast, six lung, five colon, one prostate and three ovary cancer patients. Tears were analysed using 2-D gel electrophoresis (n = 25) and 1-D electrophoresis (n = 3). Lacryglobin was present in the following percentage of patients: breast cancer (88%), lung (83%), colon (100%), ovary (33%), prostate (100%) and controls (60%). Two control patients with lacryglobin had a family history of breast and prostate cancer. Lacryglobin was detected in some but not all tear samples and further studies are warranted to investigate its potential as a marker for cancer.
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Colpitts TL, Billing P, Granados E, Hodges S, Menhart N, Russell J, Stroupe S. Mammaglobin complexes with BU101 in breast tissue. Ann N Y Acad Sci 2001; 923:312-5. [PMID: 11193768 DOI: 10.1111/j.1749-6632.2000.tb05540.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Daniel RW, Ahdieh L, Hayden D, Cu-Uvin S, Shah KV. Intra-laboratory reproducibility of human papillomavirus identification in cervical specimens by a polymerase chain reaction-based assay. J Clin Virol 2000; 19:187-93. [PMID: 11090755 DOI: 10.1016/s1386-6532(00)00142-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
BACKGROUND polymerase chain reaction (PCR)-based assays for human papillomavirus (HPV) sequences are in wide use in clinical and epidemiological studies. The reproducibility of these assays is not extensively studied. OBJECTIVES to estimate the intra-laboratory reproducibility of generic and type-specific HPV diagnoses by the MY09/MY11/HMB01 consensus L1 primer-based PCR assay. STUDY DESIGN systematically collected specimens (n=207) were masked and retested. RESULTS when specimens negative in both initial and repeat assays were excluded from analysis, the diagnostic reproducibility was 98. 6% for beta-globin, 90.7% for generic HPV (any HPV type), and 76.9% for type-specific HPVs. The reproducibility of type-specific diagnosis increased with increase in signal strength in the hybridization reaction of the initial assay. When a specimen contained five or more HPV types in the initial assay, it was rare to identify all of the HPV types in the repeat assay. CONCLUSIONS the degree of reproducibility of the PCR diagnosis should be taken into account in the interpretation of HPV data in clinical and epidemiological studies.
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FANELLI AR, ANTONINI E, CAPUTO A. Studies on the structure of hemoglobin. I. Physicochemical properties of human globin. ACTA ACUST UNITED AC 2000; 30:608-15. [PMID: 13618268 DOI: 10.1016/0006-3002(58)90108-2] [Citation(s) in RCA: 564] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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42
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43
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O'HAGAN JE, GEORGE P. The haem-globin linkage. 2. Artificial myo globins from haematins lacking free carboxyl groups. Biochem J 1998; 74:424-7. [PMID: 14428080 PMCID: PMC1204235 DOI: 10.1042/bj0740424] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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GIBSON QH, ANTONINI E. Kinetic studies on the reaction between native globin and haem derivatives. Biochem J 1998; 77:328-41. [PMID: 13705128 PMCID: PMC1204989 DOI: 10.1042/bj0770328] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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45
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46
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MULLER CJ. Separation of the alpha- and beta-chains of globins by means of starch-gel electrophoresis. Nature 1998; 186:643. [PMID: 14425145 DOI: 10.1038/186643a0] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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47
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NATHAN DG, PIOMELLI S, GARDNER FH. The synthesis of heme and globin in the maturing human erythroid cell. J Clin Invest 1998; 40:940-6. [PMID: 13727909 PMCID: PMC290811 DOI: 10.1172/jci104333] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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48
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SCHWARTZ HC, HILL RL, CARTWRIGHT GE, WINTROBE MM. The stimulation of heme synthesis by globin. ACTA ACUST UNITED AC 1998; 36:567-8. [PMID: 14443983 DOI: 10.1016/0006-3002(59)90213-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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49
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WALTER H, ZIPPER H. Utilization of serum-protein-bound glycine in the formation of globin and haem. Biochem J 1998; 84:531-6. [PMID: 14004765 PMCID: PMC1243709 DOI: 10.1042/bj0840531] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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50
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SASAKAWA S. Studies on hemoglobin. VI. Amino acid compositions of the fractionated bovine globin alpha and beta. J Biochem 1998; 50:345-51. [PMID: 14497318 DOI: 10.1093/oxfordjournals.jbchem.a127455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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