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Abstract: XG blood group antigen is an erythrocyte antigen with special genetic significance.The genes of XG blood group antigen are two closely linked and independent genes.This paper introduces the detailed information of gene exon sequence,length and coding of each coding segment,coding translation product sequence and so on.The hereditary characteristics of antigen genes on X and Y chromosomes are briefly described in detail.XG blood group antigen gene is a unique gene.The in-depth study of this gene has overturned the Leon theory of genetics in the past and has important genetic significance.XG2 antigen is a membrane differentiation antigen CD99,which participates in the erythrocyte immune mechanism and is one of the markers of cancer,and has important clinical significance.XG antigen generally does not cause transfusion hemolytic reaction and neonatal hemolytic disease,but it can interfere with clinical blood transfusion test and cause confusion of blood transfusion.
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