| http://www.w3.org/ns/prov#value | - Rather, NK cells have innate cytolytic activity and are stimulated to broader and higher levels of activity by cytokines,1 which are low-molecular-weight proteins that are released by other immune cells (as well as other cells in the body) in response to infectious agents, such as bacteria, viruses, fungi, and parasites (Rabin, 1999, p. 64).
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