Shows chemotactic activity for lymphocytes and monocytes but not neutrophils. Also shows potent myelo-suppressive activity, suppresses proliferation of myeloid progenitor cells. Recombinant SCYA16 shows chemotactic activity for monocytes and THP-1 monocytes, but not for resting lymphocytes and neutrophils. Induces a calcium flux in THP-1 cells that were desensitized by prior expression to RANTES. Mainly expressed in liver, also found in spleen and thymus. Highly expressed in LPS- and IFN-gamma-activated monocytes, weakly in some lymphocytes, including natural killer cells, gamma-delta T-cells, and some T-cell clones. The ability of HCC-4 to markedly improve recognition of poorly immunogenic cells suggests that it could be an effective component of antitumor vaccines.