Mouse IL-10 Carrier-Free Recombinant Protein, eBioscience?. Interleukin 10 (IL-10, CSIF) is an anti-inflammatory cytokine mainly produced by macrophages and Th2 cells. IL-10 is an 18.6 kDa protein of 160 amino acid residues that shares over 80% sequence homology with the Epstein-Barr Virus protein (BCRFI). The reported biological activities of IL-10, which maybe interrelated, include inhibition of macrophage-mediated cytokine synthesis, suppression of the delayed-type hyper-sensitivity response, and stimulation of the Th2 cell response which results in elevated antibody production. IL-10 functions by inhibiting pro-inflammatory cytokines made by macrophages and regulatory T cells including IFN-gamma, TNF-alpha, IL-2, and IL-3, IL-4, a