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Note: The genes of the major histocompatibility complex and the molecules they determine are grouped into 2 classes. Glycoprotein molecules of class I are expressed on all nucleated cells and are recognized by CD8 on the surface of cytotoxic T cells. Glycoprotein molecules of class II are restricted to antigen-presenting cells and are recognized by CD4 on the surface of helper T cells.—often used before another noun —abbreviation MHC compare HLA
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