Which cytokine family includes signaling molecules that modulate immune responses such as inflammation and leukocyte recruitment?

• A. Autocrine (cytokine action)
• B. Chemokines (cytokine)
• C. Interleukins (cytokine)
• D. Endocrine (cytokine action)

Answer: (C)

Cytokines in the interleukin family are signaling molecules produced by leukocytes that regulate communication between immune cells and shape immune responses. They modulate inflammation and influence how immune cells become activated, differentiate, and respond at sites of infection, which includes guiding leukocyte recruitment indirectly through promoting inflammatory signals. The other terms describe how signals act (autocrine or endocrine) or a more specific subgroup focused on directing cell movement (chemokines), rather than the broader family of inflammatory signaling molecules.