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Based on the difference in amino acid sequence between the two cysteine residues at the N-terminus, chemokines are divided into four main subfamilies: CXC, CC, CX3C, and XC. Among them, CC chemokine protein is different in that it has two adjacent cysteine near the amino terminus. The study found that in mammals, this subgroup has at least 27 different members, called CC chemokine ligands (CCL) -1 to -28, where CCL10 is the same as CCL9. It is known from the results of existing studies that CC chemokines can induce the migration of monocytes and other cell types such as NK cells and dendritic cells.