The absence of DR51 in a DRB5-positive individual DR2ES is caused by a null allele (DRB5*0108N)

Abstract excerpt

DR51, a protein encoded by the DRB5 gene, was shown to be present in almost all DR2-positive haplotypes. Exceptions were reported, some DR2-negative samples were shown to be DR51 positive and in a number of DR2-positive samples no DR51 antigen could be demonstrated. In some of them lack of the DRB5 gene was the cause of the absence of DR51 but in others the DRB5 gene was present without resulting in a detectable...

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