The T cells, when alerted by dendritic cells, behave as soldiers and generals, spitting out cytokines; the B cells use antibodies to connect to antigens as if they are keys in search of a lock. Macrophages, neutrophils, and natural killer cells roam the body, tasting and exploring, killing. These networks get connected by signals, chemical transmissions, or processes; are spurred on by interferon and interleukin; and can induce powerful side effects, like fever.
