Final answer:
IL-12 is a cytokine signaling molecule that has both local and systemic effects in the immune response. Locally, it stimulates cytotoxic T cells, phagocytosis, and antigen presentation, while systemically, it stimulates antibody secretion by B cells.
Step-by-step explanation:
IL-12, or interleukin-12, is a cytokine signaling molecule that plays a crucial role in the immune response.
Local effects of IL-12 include stimulating cytotoxic T cell immune response, phagocytosis, and antigen presentation at the site of infection, as well as bringing antigens to the lymph nodes.
Systemic effects of IL-12 include stimulating antibody secretion by B cells.