a specific protein-binding site on a cell's surface
or interior. When chemical messengers bind to receptors, various cellular
functions are activated or inhibited. Many drugs exert their effects by
binding to receptors and altering normal cellular communication. Viruses
enter cells by fusing with receptors on the cell surface, often in conjunction
with MHC molecules and/or co-receptors.
ReceptorJAMA A molecule on the surface of a cell that serves as a recognition or binding site for antigens, antibodies,
or other cellular or immunological components. See also Antibodies; Antigen.
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