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CKR8/CCR8, or C-C chemokine receptor type 8, is a G protein-coupled, seven-transmembrane domain receptor protein. Chemokines are key molecules in directing leukocyte migration toward sites of inflammation. The human C-C chemokine I-309 is a monocyte chemoattractant and inhibits apoptosis in thymic cell lines. It has been found that CKR8/CCR8 is a receptor for chemokines SCYA1/I-309, SCYA4/MIP-1-beta, and SCYA17/TARC (1-3).