Human Ia antigens are polymorphic cell-surface sialoglycoproteins which have restricted tissue distribution. They are bimolecular complexes of 34,000 (alpha) and 28,000 (beta) molecular weight and most of the polymorphism is found in the smaller polypeptides. They are involved in the initiation of immune responses and particular Ia antigens are associated with increased susceptibility to certain diseases. They are also the major barrier to human allogeneic tissue transplantation. Whereas sero...Expand abstract
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HLA-DR products are a subset of human Ia antigens.
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