How do helper T-cells and cytotoxic T-cells work together?
a. Helper T-cells produce cytotoxic T-cells.
b. Cytotoxic T-cells attack abnormal body cells, while helper T-cells attack virally infected cells.
c. Helper T-cells produce cytokines to activate other cells of the immune system.
d. Cytotoxic T-cells produce cytokines to activate helper T-cells.
Answer: c. Helper T-cells produce cytokines to activate other cells of the immune system.
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