Biologically active substances whose activities affect or play a role in the functioning of the immune system.

Synonyms: Response Modifier, Biological, Immunologic Factors, Modifiers, Biological Response, Immune Factor, Biological Response Modifier, Factor, Immunological, Biomodulators, Biomodulator, Response Modifiers, Biological, Factors, Immunological, Immunological Factor, Immune Factors, Immunomodulator, 0, Factors, Immunologic, Factors, Immune, Modifier, Biological Response, Factor, Immune, Immunological Factors, Biological Response Modifiers, Immunomodulators