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Denomme GA. Defining the breakpoints of hybrid blood group alleles. Blood Transfus 2024; 22:185-186. [PMID: 38709672 PMCID: PMC11073626 DOI: 10.2450/bloodtransfus.763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Affiliation(s)
- Gregory A Denomme
- Medical Affairs, Grifols Diagnostic Solutions, San Marcos, and Department of Health Sciences, School of Health Professions, UT Health, San Antonio, TX, United States of America
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2
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Hellberg Å, Arsenovic MG, Sørvoll IH, Lubenow N, Sareneva I, Haimila K, Nordström M, Olsson ML, Storry JR. A novel nonsense variant in RHAG underlies a Nordic Rh null phenotype. Vox Sang 2023; 118:690-694. [PMID: 37265146 DOI: 10.1111/vox.13478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/09/2023] [Accepted: 05/18/2023] [Indexed: 06/03/2023]
Abstract
BACKGROUND AND OBJECTIVES The extremely rare Rhnull phenotype is characterized by the absence of all Rh antigens on erythrocytes. It is divided into the regulator and amorph types based on the underlying genetic background. The more common regulator type depends on critical variants silencing RHAG, which encodes RhAG glycoprotein, necessary for RhD/RhCE expression. Rhnull cells have altered expression of glycophorin B and LW glycoprotein. MATERIALS AND METHODS Four unrelated Rhnull individuals were investigated. Serological testing was performed according to standard blood bank practice. RHD/RHCE and S/s allele-specific Polymerase chain reaction (PCR) genotyping was done on genomic DNA using in-house PCR assays. RHAG, and in some cases also RHD/RHCE, were sequenced. Initial s phenotyping results triggered additional serological investigation. RESULTS Anti-Rh29 was identified in all four individuals. Extended typing with anti-S and anti-s showed that the three samples predicted to type as s+ failed to react with 2 of 5 anti-s. Sequence analysis of all 10 RHAG exons and the immediate intron/exon boundaries revealed a single nucleotide variant in the 3'-end of intron 6, c.946 -2a>g in all samples. RHD/RHCE showed no alterations. CONCLUSION A novel Nordic Rhnull allele was identified. In addition, it was shown that s+ Rhnull red blood cells are not only U- but also have qualitative changes in their s antigen expression.
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Affiliation(s)
- Åsa Hellberg
- Department of Clinical Immunology and Transfusion Medicine, Office for Medical Services, Region Skåne, Sweden
| | | | | | - Norbert Lubenow
- Department of Clinical Immunology and Transfusion Medicine, Uppsala University Hospital, Uppsala, Sweden
| | | | | | - Magnus Nordström
- Division of Clinical Immunology and Transfusion Medicine, Department of Laboratory Medicine, Region Västerbotten, Sweden
| | - Martin L Olsson
- Department of Clinical Immunology and Transfusion Medicine, Office for Medical Services, Region Skåne, Sweden
- Division of Hematology and Transfusion Medicine, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Jill R Storry
- Department of Clinical Immunology and Transfusion Medicine, Office for Medical Services, Region Skåne, Sweden
- Division of Hematology and Transfusion Medicine, Department of Laboratory Medicine, Lund University, Lund, Sweden
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3
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Thonier VL, Floch A, Babinet J, Pirenne F, Vege S, Tournamille C, Westhoff CM, Peyrard T. First report of a null allele on a GYPB*s background: GYPB*s(37 + 4_8delAGTGA). Transfusion 2022; 62:E24-E26. [PMID: 35441363 DOI: 10.1111/trf.16874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 03/09/2022] [Accepted: 03/09/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Vincent Louis Thonier
- Centre National de Référence pour les Groupes Sanguins, Etablissement français du sang Ile-de-France, Paris, France.,UMR_S1134 Inserm, Université de Paris Cité, Paris, France
| | - Aline Floch
- Immunohematology and Genomics Laboratory, New York Blood Center, Long Island City, New York, USA.,Univ Paris Est Créteil, INSERM U955 Equipe 2 "Transfusion et maladies du globule rouge," IMRB, Créteil, France
| | - Jérome Babinet
- Centre National de Référence pour les Groupes Sanguins, Etablissement français du sang Ile-de-France, Paris, France
| | - France Pirenne
- Univ Paris Est Créteil, INSERM U955 Equipe 2 "Transfusion et maladies du globule rouge," IMRB, Créteil, France.,Etablissement français du sang Ile-de-France, Créteil, France
| | - Sunitha Vege
- Immunohematology and Genomics Laboratory, New York Blood Center, Long Island City, New York, USA
| | - Christophe Tournamille
- Univ Paris Est Créteil, INSERM U955 Equipe 2 "Transfusion et maladies du globule rouge," IMRB, Créteil, France.,Etablissement français du sang Ile-de-France, Créteil, France
| | - Connie M Westhoff
- Immunohematology and Genomics Laboratory, New York Blood Center, Long Island City, New York, USA
| | - Thierry Peyrard
- Centre National de Référence pour les Groupes Sanguins, Etablissement français du sang Ile-de-France, Paris, France.,UMR_S1134 Inserm, Université de Paris Cité, Paris, France
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4
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Amuzu DS, Rockett KA, Leffler EM, Ansah F, Amoako N, Morang'a CM, Hubbart C, Rowlands K, Jeffreys AE, Amenga-Etego LN, Kwiatkowski DP, Awandare GA. High-throughput genotyping assays for identification of glycophorin B deletion variants in population studies. Exp Biol Med (Maywood) 2020; 246:916-928. [PMID: 33325748 PMCID: PMC8022085 DOI: 10.1177/1535370220968545] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Glycophorins are the most abundant sialoglycoproteins on the surface of human erythrocyte membranes. Genetic variation in glycophorin region of human chromosome 4 (containing GYPA, GYPB, and GYPE genes) is of interest because the gene products serve as receptors for pathogens of major public health interest, including Plasmodiumsp., Babesiasp., Influenza virus, Vibrio cholerae El Tor Hemolysin, and Escherichia coli. A large structural rearrangement and hybrid glycophorin variant, known as Dantu, which was identified in East African populations, has been linked with a 40% reduction in risk for severe malaria. Apart from Dantu, other large structural variants exist, with the most common being deletion of the whole GYPB gene and its surrounding region, resulting in multiple different deletion forms. In West Africa particularly, these deletions are estimated to account for between 5 and 15% of the variation in different populations, mostly attributed to the forms known as DEL1 and DEL2. Due to the lack of specific variant assays, little is known of the distribution of these variants. Here, we report a modification of a previous GYPB DEL1 assay and the development of a novel GYPB DEL2 assay as high-throughput PCR-RFLP assays, as well as the identification of the crossover/breakpoint for GYPB DEL2. Using 393 samples from three study sites in Ghana as well as samples from HapMap and 1000 G projects for validation, we show that our assays are sensitive and reliable for genotyping GYPB DEL1 and DEL2. To the best of our knowledge, this is the first report of such high-throughput genotyping assays by PCR-RFLP for identifying specific GYPB deletion types in populations. These assays will enable better identification of GYPB deletions for large genetic association studies and functional experiments to understand the role of this gene cluster region in susceptibility to malaria and other diseases.
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Affiliation(s)
- Dominic Sy Amuzu
- West African Centre for Cell Biology of Infectious Pathogens, University of Ghana, Accra, GH 0233, Ghana.,Department of Biochemistry, Cell and Molecular Biology, University of Ghana, Accra, GH 0233, Ghana.,Wellcome Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7BN, UK
| | - Kirk A Rockett
- Wellcome Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7BN, UK.,Wellcome Sanger Institute, Hinxton CB10 1SA, UK
| | - Ellen M Leffler
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK.,Department of Human Genetics, Eccles Institute of Human Genetics, University of Utah, Salt Lake City, UT 84112-5330, USA
| | - Felix Ansah
- West African Centre for Cell Biology of Infectious Pathogens, University of Ghana, Accra, GH 0233, Ghana.,Department of Biochemistry, Cell and Molecular Biology, University of Ghana, Accra, GH 0233, Ghana
| | - Nicholas Amoako
- West African Centre for Cell Biology of Infectious Pathogens, University of Ghana, Accra, GH 0233, Ghana.,Department of Biochemistry, Cell and Molecular Biology, University of Ghana, Accra, GH 0233, Ghana
| | - Collins M Morang'a
- West African Centre for Cell Biology of Infectious Pathogens, University of Ghana, Accra, GH 0233, Ghana.,Department of Biochemistry, Cell and Molecular Biology, University of Ghana, Accra, GH 0233, Ghana
| | - Christina Hubbart
- Wellcome Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7BN, UK
| | - Kate Rowlands
- Wellcome Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7BN, UK
| | - Anna E Jeffreys
- Wellcome Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7BN, UK
| | - Lucas N Amenga-Etego
- West African Centre for Cell Biology of Infectious Pathogens, University of Ghana, Accra, GH 0233, Ghana.,Department of Biochemistry, Cell and Molecular Biology, University of Ghana, Accra, GH 0233, Ghana
| | - Dominic P Kwiatkowski
- Wellcome Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7BN, UK.,Wellcome Sanger Institute, Hinxton CB10 1SA, UK.,Big Data Institute, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, UK
| | - Gordon A Awandare
- West African Centre for Cell Biology of Infectious Pathogens, University of Ghana, Accra, GH 0233, Ghana.,Department of Biochemistry, Cell and Molecular Biology, University of Ghana, Accra, GH 0233, Ghana
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Algady W, Weyell E, Mateja D, Garcia A, Courtin D, Hollox EJ. Genotyping complex structural variation at the malaria-associated human glycophorin locus using a PCR-based strategy. Ann Hum Genet 2020; 85:7-17. [PMID: 32895931 DOI: 10.1111/ahg.12405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/23/2020] [Accepted: 08/15/2020] [Indexed: 02/06/2023]
Abstract
Structural variation in the human genome can affect risk of disease. An example is a complex structural variant of the human glycophorin gene cluster, called DUP4, which is associated with a clinically significant level of protection against severe malaria. The human glycophorin gene cluster harbours at least 23 distinct structural variants, and accurate genotyping of this complex structural variation remains a challenge. Here, we use a polymerase chain reaction-based strategy to genotype structural variation at the human glycophorin gene cluster, including the alleles responsible for the U- blood group. We validate our approach, based on a triplex paralogue ratio test, on publically available samples from the 1000 Genomes project. We then genotype 574 individuals from a longitudinal birth cohort (Tori-Bossito cohort) using small amounts of DNA at low cost. Our approach readily identifies known deletions and duplications, and can potentially identify novel variants for further analysis. It will allow exploration of genetic variation at the glycophorin locus, and investigation of its relationship with malaria, in large sample sets at minimal cost, using standard molecular biology equipment.
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Affiliation(s)
- Walid Algady
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Eleanor Weyell
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Daria Mateja
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - André Garcia
- UMR 261 MERIT, Institut de Recherche pour le Développement (IRD), Université de Paris, Paris, France
| | - David Courtin
- UMR 261 MERIT, Institut de Recherche pour le Développement (IRD), Université de Paris, Paris, France
| | - Edward J Hollox
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
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6
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Louzada S, Algady W, Weyell E, Zuccherato LW, Brajer P, Almalki F, Scliar MO, Naslavsky MS, Yamamoto GL, Duarte YAO, Passos-Bueno MR, Zatz M, Yang F, Hollox EJ. Structural variation of the malaria-associated human glycophorin A-B-E region. BMC Genomics 2020; 21:446. [PMID: 32600246 PMCID: PMC7325229 DOI: 10.1186/s12864-020-06849-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 06/18/2020] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Approximately 5% of the human genome shows common structural variation, which is enriched for genes involved in the immune response and cell-cell interactions. A well-established region of extensive structural variation is the glycophorin gene cluster, comprising three tandemly-repeated regions about 120 kb in length and carrying the highly homologous genes GYPA, GYPB and GYPE. Glycophorin A (encoded by GYPA) and glycophorin B (encoded by GYPB) are glycoproteins present at high levels on the surface of erythrocytes, and they have been suggested to act as decoy receptors for viral pathogens. They are receptors for the invasion of the protist parasite Plasmodium falciparum, a causative agent of malaria. A particular complex structural variant, called DUP4, creates a GYPB-GYPA fusion gene known to confer resistance to malaria. Many other structural variants exist across the glycophorin gene cluster, and they remain poorly characterised. RESULTS Here, we analyse sequences from 3234 diploid genomes from across the world for structural variation at the glycophorin locus, confirming 15 variants in the 1000 Genomes project cohort, discovering 9 new variants, and characterising a selection of these variants using fibre-FISH and breakpoint mapping at the sequence level. We identify variants predicted to create novel fusion genes and a common inversion duplication variant at appreciable frequencies in West Africans. We show that almost all variants can be explained by non-allelic homologous recombination and by comparing the structural variant breakpoints with recombination hotspot maps, confirm the importance of a particular meiotic recombination hotspot on structural variant formation in this region. CONCLUSIONS We identify and validate large structural variants in the human glycophorin A-B-E gene cluster which may be associated with different clinical aspects of malaria.
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Affiliation(s)
- Sandra Louzada
- Wellcome Sanger Institute, Hinxton, Cambridge, UK
- Present address: Laboratory of Cytogenomics and Animal Genomics (CAG), Department of Genetics and Biotechnology, University of Trás-os-Montes and Alto Douro (UTAD), Vila Real, Portugal
- Present address: BioISI - Biosystems & Integrative Sciences Institute, Faculty of Sciences, University of Lisboa, Lisbon, Portugal
| | - Walid Algady
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Eleanor Weyell
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Luciana W Zuccherato
- Department of Pathology, Faculty of Medicine, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Paulina Brajer
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Faisal Almalki
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Marilia O Scliar
- Human Genome and Stem Cell Research Center, Department of Genetics and Evolutionary Biology, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Michel S Naslavsky
- Human Genome and Stem Cell Research Center, Department of Genetics and Evolutionary Biology, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Guilherme L Yamamoto
- Human Genome and Stem Cell Research Center, Department of Genetics and Evolutionary Biology, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Yeda A O Duarte
- School of Nursing, Universidade de São Paulo, São Paulo, Brazil
| | - Maria Rita Passos-Bueno
- Human Genome and Stem Cell Research Center, Department of Genetics and Evolutionary Biology, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | - Mayana Zatz
- Human Genome and Stem Cell Research Center, Department of Genetics and Evolutionary Biology, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
| | | | - Edward J Hollox
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK.
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7
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Lane WJ, Gleadall NS, Aeschlimann J, Vege S, Sanchis-Juan A, Stephens J, Sullivan JC, Mah HH, Aguad M, Smeland-Wagman R, Lebo MS, Vijay Kumar PK, Kaufman RM, Green RC, Ouwehand WH, Westhoff CM. Multiple GYPB gene deletions associated with the U- phenotype in those of African ancestry. Transfusion 2020; 60:1294-1307. [PMID: 32473076 DOI: 10.1111/trf.15839] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 02/25/2020] [Accepted: 04/02/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND The MNS blood group system is defined by three homologous genes: GYPA, GYPB, and GYPE. GYPB encodes for glycophorin B (GPB) carrying S/s and the "universal" antigen U. RBCs of approximately 1% of individuals of African ancestry are U- due to absence of GPB. The U- phenotype has long been attributed to a deletion encompassing GYPB exons 2 to 5 and GYPE exon 1 (GYPB*01N). STUDY DESIGN AND METHODS Samples from two U-individuals underwent Illumina short read whole genome sequencing (WGS) and Nanopore long read WGS. In addition, two existing WGS datasets, MedSeq (n = 110) and 1000 Genomes (1000G, n = 2535), were analyzed for GYPB deletions. Deletions were confirmed by Sanger sequencing. Twenty known U- donor samples were tested by a PCR assay to determine the specific deletion alleles present in African Americans. RESULTS Two large GYPB deletions in U- samples of African ancestry were identified: a 110 kb deletion extending left of GYPB (DEL_B_LEFT) and a 103 kb deletion extending right (DEL_B_RIGHT). DEL_B_LEFT and DEL_B_RIGHT were the most common GYPB deletions in the 1000 Genomes Project 669 African genomes (allele frequencies 0.04 and 0.02). Seven additional deletions involving GYPB were seen in African, Admixed American, and South Asian samples. No samples analyzed had GYPB*01N. CONCLUSIONS The U- phenotype in those of African ancestry is primarily associated with two different complete deletions of GYPB (with intact GYPE). Seven additional less common GYPB deletion backgrounds were found. GYPB*01N, long assumed to be the allele commonly encoding U- phenotypes, appears to be rare.
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Affiliation(s)
- William J Lane
- Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - Nicholas S Gleadall
- Department of Haematology, University of Cambridge, Cambridge, UK.,NHS Blood and Transplant, Cambridge, UK
| | | | | | - Alba Sanchis-Juan
- Department of Haematology, University of Cambridge, Cambridge, UK.,NHS Blood and Transplant, Cambridge, UK.,NIHR BioResource, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Jonathan Stephens
- Department of Haematology, University of Cambridge, Cambridge, UK.,NHS Blood and Transplant, Cambridge, UK.,NIHR BioResource, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | | | - Helen H Mah
- Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts
| | - Maria Aguad
- Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts
| | | | - Matthew S Lebo
- Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts.,Harvard Medical School, Boston, Massachusetts.,Laboratory for Molecular Medicine, Boston, Massachusetts.,Partners Personalized Medicine, Boston, Massachusetts
| | | | - Richard M Kaufman
- Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts.,Harvard Medical School, Boston, Massachusetts
| | - Robert C Green
- Harvard Medical School, Boston, Massachusetts.,Partners Personalized Medicine, Boston, Massachusetts.,Broad Institute of MIT and Harvard, Boston, Massachusetts.,Division of Genetics, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Willem H Ouwehand
- Department of Haematology, University of Cambridge, Cambridge, UK.,NHS Blood and Transplant, Cambridge, UK.,Wellcome Sanger Institute, Cambridge, UK
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8
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Gassner C. Next-Generation Sequencing in Blood Group Genomics: State of the Art and Perspectives. Transfus Med Hemother 2020; 47:2-3. [PMID: 32110188 PMCID: PMC7036589 DOI: 10.1159/000505463] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 12/14/2019] [Indexed: 12/23/2022] Open
Affiliation(s)
- Christoph Gassner
- Independent Researcher, Immunogenetics and Immunohematology, Zurich, Switzerland
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