Illustrates the progression of steps involved in the body's immune response to a cancer cell. Clockwise from the middle left: Cytokine type 2 messengers (orange) stimulate a helper T cell (blue) to release type 1 cytokines, which in turn activate the killer T cell (lavender), which in turn, seeks to destroy the cancer cell. The killer T cell punctures and poisons the cancer cell (bottom). Type 2 Cytokines are released by either B cells or dendritic cells.