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Liu Q, Hong Y, Wang C, Liu Y, Liu C. Tri(3‐alkoxyl‐3‐oxopropyl) phosphine oxides derived from
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tail gas as a novel phosphorus‐containing plasticizer for polylactide. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Qing‐Wen Liu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan People's Republic of China
| | - Yu‐Lin Hong
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan People's Republic of China
| | - Chang Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan People's Republic of China
| | - Yun Liu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan People's Republic of China
- School of Chemical and Environmental Engineering Jianghan University Wuhan People's Republic of China
| | - Cheng‐Mei Liu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan People's Republic of China
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Cheng J, Zhu N, Zhang Y, Yu Y, Kang K, Yi Q, Wu Y. Hedgehog-inspired immunomagnetic beads for high-efficient capture and release of exosomes. J Mater Chem B 2022; 10:4059-4069. [PMID: 35521754 DOI: 10.1039/d2tb00226d] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Exosomes are small extracellular vesicles secreted by cells. They play an important regulatory role in the physiological and pathological processes of the body, and participate in the occurrence and development of many diseases. Although tumor-derived exosomes have been used as biomarkers for cancer detection, it is still a huge challenge to efficiently capture and release functionally complete exosomes. In our research, inspired by the structure of hedgehog burrs, we proposed immunomagnetic hedgehog particles (IMHPs) to efficiently capture and release exosomes. In general, after the assembly of one-dimensional nanostructural TiO2 bundles into hedgehog TiO2 particles with 356.12 ± 38.32 nm spikes, magnetic responsive nanoparticles (Fe3O4, ∼20 nm), an antifouling polyethylene glycol (PEG) component containing a redox responsive disulfide linkage and anti-CD63 antibody were introduced stepwise to functionalize hedgehog particles and generate IMHPs (1.23 ± 0.18 μm). Due to their unique topological structures, exosomes were positively selected with an exosomal marker (CD63) and negatively selected by depleting environmental pollutants (protein precipitates, cell debris) with the nano-spikes. These prepared IMHPs were successfully applied to capture exosomes from MCF-7 cells, with a capture efficiency of 91.70%. Then, tris (2-carboxyethyl) phosphine hydrochloride (TCEP) was used to reduce the disulfide bond to release exosomes, and the release efficiency was up to 82.45%. The exosomes that experienced successive immunomagnetic separation and release well maintained their structural integrity and good bioactivity to promote MCF-7 cell migration, as compared with those exosomes separated by the classic ultracentrifugation approach. These results also indicated that IMHPs would have broad prospects in biomedicine and clinical applications, where highly efficient and non-destructive separation of bio-substances (cells, extracellular vesicles, etc.) is critically required.
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Affiliation(s)
- Jia Cheng
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China.
| | - Nanhang Zhu
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China.
| | - Yujia Zhang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China.
| | - Yue Yu
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China.
| | - Ke Kang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China.
| | - Qiangying Yi
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China.
| | - Yao Wu
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China.
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“Pincer movement”: Reversing cisplatin resistance based on simultaneous glutathione depletion and glutathione S-transferases inhibition by redox-responsive degradable organosilica hybrid nanoparticles. Acta Pharm Sin B 2022; 12:2074-2088. [PMID: 35847508 PMCID: PMC9279704 DOI: 10.1016/j.apsb.2021.10.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 09/30/2021] [Accepted: 10/04/2021] [Indexed: 12/11/2022] Open
Abstract
The therapeutic efficacy of cisplatin has been restricted by drug resistance of cancers. Intracellular glutathione (GSH) detoxification of cisplatin under the catalysis of glutathione S-transferases (GST) plays important roles in the development of cisplatin resistance. Herein, a strategy of “pincer movement” based on simultaneous GSH depletion and GST inhibition is proposed to enhance cisplatin-based chemotherapy. Specifically, a redox-responsive nanomedicine based on disulfide-bridged degradable organosilica hybrid nanoparticles is developed and loaded with cisplatin and ethacrynic acid (EA), a GST inhibitor. Responding to high level of intracellular GSH, the hybrid nanoparticles can be gradually degraded due to the break of disulfide bonds, which further promotes drug release. Meanwhile, the disulfide-mediated GSH depletion and EA-induced GST inhibition cooperatively prevent cellular detoxification of cisplatin and reverse drug resistance. Moreover, the nanomedicine is integrated into microneedles for intralesional drug delivery against cisplatin-resistant melanoma. The in vivo results show that the nanomedicine-loaded microneedles can achieve significant GSH depletion, GST inhibition, and consequent tumor growth suppression. Overall, this research provides a promising strategy for the construction of new-type nanomedicines to overcome cisplatin resistance, which extends the biomedical application of organosilica hybrid nanomaterials and enables more efficient chemotherapy against drug-resistant cancers.
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Grishin AM, Dolgova NV, Landreth S, Fisette O, Pickering IJ, George GN, Falzarano D, Cygler M. Disulfide Bonds Play a Critical Role in the Structure and Function of the Receptor-binding Domain of the SARS-CoV-2 Spike Antigen. J Mol Biol 2022; 434:167357. [PMID: 34780781 PMCID: PMC8588607 DOI: 10.1016/j.jmb.2021.167357] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 10/30/2021] [Accepted: 11/09/2021] [Indexed: 02/07/2023]
Abstract
The current coronavirus pandemic is exerting a tremendously detrimental impact on global health. The Spike proteins of coronaviruses, responsible for cell receptor binding and viral internalization, possess multiple and frequently conserved disulfide bonds raising the question about their role in these proteins. Here, we present a detailed structural and functional investigation of the disulfide bonds of the SARS-CoV-2 Spike receptor-binding domain (RBD). Molecular dynamics simulations of the RBD predict increased flexibility of the surface loops when the four disulfide bonds of the domain are reduced. This flexibility is particularly prominent for the disulfide bond-containing surface loop (residues 456-490) that participates in the formation of the interaction surface with the Spike cell receptor ACE2. In vitro, disulfide bond reducing agents affect the RBD secondary structure, lower its melting temperature from 52 °C to 36-39 °C and decrease its binding affinity to ACE2 by two orders of magnitude at 37 °C. Consistent with these in vitro findings, the reducing agents tris(2-carboxyethyl)phosphine (TCEP) and dithiothreitol (DTT) were able to inhibit viral replication at low millimolar levels in cell-based assays. Our research demonstrates the mechanism by which the disulfide bonds contribute to the molecular structure of the RBD of the Spike protein, allowing the RBD to execute its viral function.
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Affiliation(s)
- Andrey M. Grishin
- Department of Biochemistry, Microbiology and Immunology, University of Saskatchewan, 107 Wiggins Road, Saskatoon, Saskatchewan S7N 5E5, Canada,Corresponding author
| | - Nataliya V. Dolgova
- Department of Biochemistry, Microbiology and Immunology, University of Saskatchewan, 107 Wiggins Road, Saskatoon, Saskatchewan S7N 5E5, Canada,Molecular and Environmental Sciences Group, Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Shelby Landreth
- Vaccine and Infectious Disease Organization and Department of Veterinary Microbiology, University of Saskatchewan, 120 Veterinary Road, Saskatoon, Saskatchewan S7N 5E3, Canada
| | - Olivier Fisette
- Research Computing, Information and Communications Technology, University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Ingrid J. Pickering
- Molecular and Environmental Sciences Group, Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada,Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 0X2, Canada
| | - Graham N. George
- Molecular and Environmental Sciences Group, Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada,Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 0X2, Canada
| | - Darryl Falzarano
- Vaccine and Infectious Disease Organization and Department of Veterinary Microbiology, University of Saskatchewan, 120 Veterinary Road, Saskatoon, Saskatchewan S7N 5E3, Canada,Corresponding author
| | - Miroslaw Cygler
- Department of Biochemistry, Microbiology and Immunology, University of Saskatchewan, 107 Wiggins Road, Saskatoon, Saskatchewan S7N 5E5, Canada
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Bayer M, Tsiskarishvili N, Stegemann A, Böhm M, König S. Fast oxidation of α-melanocyte-stimulating hormone and derived peptides under laboratory conditions causes irreproducible results-Insights from studies of prolylcarboxypeptidase in human cell types. Pigment Cell Melanoma Res 2019; 33:378-382. [PMID: 31837203 DOI: 10.1111/pcmr.12852] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 11/21/2019] [Accepted: 12/10/2019] [Indexed: 11/27/2022]
Affiliation(s)
- Malte Bayer
- Core Unit Proteomics, Interdisciplinary Center for Clinical Research, University of Münster, Münster, Germany
| | | | - Agatha Stegemann
- Department of Dermatology, University of Münster, Münster, Germany
| | - Markus Böhm
- Department of Dermatology, University of Münster, Münster, Germany
| | - Simone König
- Core Unit Proteomics, Interdisciplinary Center for Clinical Research, University of Münster, Münster, Germany
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Sun M, Wong JY, Nugraha B, Ananthanarayanan A, Liu Z, Lee F, Gupta K, Fong EL, Huang X, Yu H. Cleavable cellulosic sponge for functional hepatic cell culture and retrieval. Biomaterials 2019; 201:16-32. [DOI: 10.1016/j.biomaterials.2019.01.046] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Revised: 01/18/2019] [Accepted: 01/20/2019] [Indexed: 12/27/2022]
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Weingart OG, Loessner MJ. Nerve cell-mimicking liposomes as biosensor for botulinum neurotoxin complete physiological activity. Toxicol Appl Pharmacol 2016; 313:16-23. [PMID: 27743862 DOI: 10.1016/j.taap.2016.10.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Revised: 09/02/2016] [Accepted: 10/10/2016] [Indexed: 10/20/2022]
Abstract
Botulinum neurotoxins (BoNT) are the most toxic substances known, and their neurotoxic properties and paralysing effects are exploited for medical treatment of a wide spectrum of disorders. To accurately quantify the potency of a pharmaceutical BoNT preparation, its physiological key activities (binding to membrane receptor, translocation, and proteolytic degradation of SNARE proteins) need to be determined. To date, this was only possible using animal models, or, to a limited extent, cell-based assays. We here report a novel in vitro system for BoNT/B analysis, based on nerve-cell mimicking liposomes presenting motoneuronal membrane receptors required for BoNT binding. Following triggered membrane translocation of the toxin's Light Chain, the endopeptidase activity can be quantitatively monitored employing a FRET-based reporter assay within the functionalized liposomes. We were able to detect BoNT/B physiological activity at picomolar concentrations in short time, opening the possibility for future replacement of animal experimentation in pharmaceutical BoNT testing.
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Affiliation(s)
- Oliver G Weingart
- Institute for Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, CH-8092 Zurich, Switzerland.
| | - Martin J Loessner
- Institute for Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, CH-8092 Zurich, Switzerland
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Kristiansen A, Grgic M, Altermark B, Leiros I. Properties and distribution of a metallo-β-lactamase (ALI-1) from the fish pathogen Aliivibrio salmonicida LFI1238. J Antimicrob Chemother 2014; 70:766-72. [PMID: 25362569 DOI: 10.1093/jac/dku433] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES To characterize the chromosome-encoded metallo-β-lactamase (MBL) from the psychrophilic, marine fish-pathogenic bacterium Aliivibrio salmonicida LFI1238 and check for the presence of the gene in other Aliivibrio isolates both connected to the fish-farming industry and from the environment. METHODS The MBL gene was cloned and intracellularly expressed in Escherichia coli. Kinetic parameters, NaCl dependence, pH optimum and temperature optimum were determined using purified enzyme. The VIM-2 enzyme from a Pseudomonas aeruginosa hospital isolate was used as a counterpart in comparative analysis. PCRs with degenerate MBL primers were used to screen different A. salmonicida isolates for the presence of the gene. RESULTS A. salmonicida MBL (ALI-1) is an Ambler class B β-lactamase sharing 39% and 29% amino acid identity with IMP-1 and VIM-2, respectively. ALI-1 hydrolysed all β-lactam antibiotics tested, except for the monobactam aztreonam and the penicillin piperacillin. A profound increase in activity was observed when adding NaCl to the assay mixture (60% active without addition of NaCl, increasing to 100% at 0.5 M NaCl). The increase was less noticeable for VIM-2 (100% active at 0.2 M NaCl). ALI-1 appears to be ubiquitous in nature as it is found in Aliivibrio isolates not affected by human activity. CONCLUSIONS This work provides more data for the ever-expanding MBL group of enzymes. These periplasmic enzymes are activated by addition of NaCl, and the marine enzyme is highly salt tolerant and cold active. The observed enzyme properties very likely reflect the conditions that the enzymes face in situ.
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Affiliation(s)
- Anders Kristiansen
- The Norwegian Structure Biology Centre (NorStruct), Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway
| | - Miriam Grgic
- The Norwegian Structure Biology Centre (NorStruct), Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway
| | - Bjørn Altermark
- The Norwegian Structure Biology Centre (NorStruct), Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway
| | - Ingar Leiros
- The Norwegian Structure Biology Centre (NorStruct), Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway
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Tachaprutinun A, Pan-In P, Samutprasert P, Banlunara W, Chaichanawongsaroj N, Wanichwecharungruang S. Acrylate-tethering drug carrier: covalently linking carrier to biological surface and application in the treatment of Helicobacter pylori infection. Biomacromolecules 2014; 15:4239-48. [PMID: 25300443 DOI: 10.1021/bm5012618] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The development of carriers to sustain drugs at stomach surface is an attractive strategy to increase drug bioavailability locally and systematically. So far, the only reported carrier that can form a covalent bond with mucus, the thiolated carrier, relies on a reversible disulfide exchange reaction between thiols on the carrier and disulfide bridges on the mucus. Here we show the design and fabrication of a cellulose carrier with tethering acrylate groups (denoted here as clickable carrier) that, under a nontoxic condition, can efficiently react with thiols on biomaterials in situ through the thermodynamically driven and kinetically probable Michael thiol-ene click reaction. Here we show the attachments of the clickable carriers to a mucin protein, a surface of human laryngeal carcinoma cells, and a surface of a fresh porcine stomach. We also show that the required thiol moieties can be generated in situ by reducing existing cystine disulfide bridges with either the edible vitamin C or the relatively nontoxic tris(2-carboxyethyl) phosphine. Comparing to a control carrier, the clickable carrier can increase some drug concentrations in an ex vivo stomach tissue, and improve the Helicobacter pylori treatment in infected C57BL/6 mice.
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Affiliation(s)
- Amornset Tachaprutinun
- Department of Chemistry, Faculty of Science, ‡Department of Pathology, Faculty of Veterinary Science, §Department of Transfusion Medicine, Faculty of Allied Health Sciences, and ∥The Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University , Bangkok, Thailand
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Toxicity of TDCPP and TCEP on PC12 cell: changes in CAMKII, GAP43, tubulin and NF-H gene and protein levels. Toxicol Lett 2014; 227:164-71. [PMID: 24717766 DOI: 10.1016/j.toxlet.2014.03.023] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 03/27/2014] [Accepted: 03/28/2014] [Indexed: 11/21/2022]
Abstract
TDCPP and TCEP are two major types of organophosphorus flame retardants (OPFRs) that are bioaccumulative and persistent in the environment. The toxicity effects of TDCPP and TCEP on PC12 cell are not well understood. In the present study, we investigated morphology, viability and apoptosis in cultured PC12 cells in response to TDCPP and TCEP. The mRNA and protein expression levels of CAMKII, GAP43, tubulin and NF-H were quantified in PC12 cells treated with varying concentrations of the two agents. Results indicate that, upon treatment with the two OPFRs, cell growth decreased, apoptosis increased, morphology was altered and significant changes were found in the gene and protein levels. Treatment with TDCPP caused a reduction in the levels of each of the six proteins studied and in the gene levels of GAP43, NF-H and the two tubulins, but it resulted in an increase in CAMKII gene levels. Treatment with TCEP resulted in similar changes in gene levels to TDCPP and led to decreases in the protein levels of GAP43 and the tubulins while increasing the CAMKII and NF-H protein levels. These results suggest that changes in the gene and protein levels of the regulatory proteins (CAMKII, GAP43) and the structural proteins (tubulin, NF-H) are due to different mechanisms of the toxins, and these proteins may be useful biomarkers for the cytotoxicity and neurotoxicity.
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Pirazzini M, Rossetto O, Bolognese P, Shone CC, Montecucco C. Double anchorage to the membrane and intact inter-chain disulfide bond are required for the low pH induced entry of tetanus and botulinum neurotoxins into neurons. Cell Microbiol 2011; 13:1731-43. [PMID: 21790947 DOI: 10.1111/j.1462-5822.2011.01654.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Tetanus and botulinum neurotoxins are di-chain proteins that cause paralysis by inhibiting neuroexocytosis. These neurotoxins enter into nerve terminals via endocytosis inside synaptic vesicles, whose acidic pH induces a structural change of the neurotoxin molecule that becomes capable of translocating its L chain into the cytosol, via a transmembrane protein-conducting channel made by the H chain. This is the least understood step of the intoxication process primarily because it takes place inside vesicles within the cytosol. In the present study, we describe how this passage was made accessible to investigation by making it to occur at the surface of neurons. The neurotoxin, bound to the plasma membrane in the cold, was exposed to a warm low pH extracellular medium and the entry of the L chain was monitored by measuring its specific metalloprotease activity with a ratiometric method. We found that the neurotoxin has to be bound to the membrane via at least two anchorage sites in order for a productive low-pH induced structural change to take place. In addition, this process can only occur if the single inter-chain disulfide bond is intact. The pH dependence of the conformational change of tetanus neurotoxin and botulinum neurotoxin B, C and D is similar and take places in the same slightly acidic range, which comprises that present inside synaptic vesicles. Based on these and previous findings, we propose a stepwise sequence of molecular events that lead from toxin binding to membrane insertion.
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Affiliation(s)
- Marco Pirazzini
- Dipartimento di Scienze Biomediche and Istituto CNR di Neuroscienze, Università di Padova, Viale G. Colombo 3, 35131 Padova, Italy
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Affiliation(s)
- Mauricio Montal
- Section of Neurobiology, Division of Biological Sciences, University of California San Diego, La Jolla, California 92093-0366;
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