April 25th, 2009

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Individuals have the ability to express two HLA antigens within each category of antigens (one set being inherited from each biological parent). When an individual has apparently inherited the same antigen from both parents, the HLA typing of that individual is designated by the shared HLA antigen followed by a “blank” (-). For example, if one parent contributes an HLA-A2, B7, DR4 set of antigens and the second parent contributes an HLA-A2, B8, DR4 set, the child's HLA typing will be denoted an HLA-A2,-;B7,8;DR4-.

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