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| | biology - Immune system |
 | | For instance, the plasma membrane of every nucleated cell contains molecules of a large glycoprotein called the major histocompatibility complex (MHC). |
 | | T cells, a group that encompasses cytotoxic T lymphocytes (CTLs), the cells that kill virally-infected cells, contain surface-mounted receptors that they use to determine if a given cell is virally infected by reading the peptides displayed on its MHC molecules. |
 | | There are several class of antimicrobial proteins, such as acute phase proteins (C-reactive protein, for example, binds to the C-protein of S. |
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