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coreceptor [ˌkəuri'septə] n
med.	A protein on the surface of a cell that serves as a second binding site for a virus or other molecule. In order to enter a host cell, HIV must bind to two sites on the cell: the primary CD4 receptor and either the CCR5 or CXCR4 coreceptor. see also CCR5, CXCR4, receptor