A<unk>  <unk>  is a lymphokine or other receptor based signal that primes macrophages towards cytotoxicity to tumors, cytokine secretion, or clearance of pathogens. Similar molecules may cause development of an inhibitory, regulatory phenotype. A<unk>  can also alter the ability of macrophages to present MHC I antigen, participate in Th responses, and/or affect other immune responses.<unk> s act typically in combination to produce a specific phenotype.
Macrophage-activating factor
Lymphokine
Major basic protein
Macrophage colony-stimulating factor
Cytokine
Tumor necrosis factor
Interleukin
Leukocyte-promoting factor