C Chemokines

The C-chemokine subfamily (γ-chemokines) lacks the first and third cysteines, and thus has only hemocysteine residues in the conserved region. This family is composed of two members, XCL1 (also known as lymphotactin/Ltn/ATAC/SCYC-1/SCM1-α) and XCL2 (SCM1-β/SCYC-2). XCL1 and XCL2 are produced by activated NK cells, CD8 T cells, γδ T cells, and NK T cells. Structurally, XCL2 and XCL1 are similar, and under physiological NaCl and temperature conditions, the folding structure of monomer chemokines and the unrelated dimer state switch between[1].