The recognition of foreign antigens by receptors on the surface of cells of the immune system is a fundamental feature of immune defenses. The receptor systems involved include the T cell receptor complex, surface Ig of B cells, class I and II histocompatibility antigens, CD4, CD8, complement recep- tors, and receptors for the Fc domain of IgG (FcYR).1 It is
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J C Unkeless (1989) studied this question.
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