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This cell becomes activated when its

This molecule is made up of protein

This cell is an effector cell that has the

This cell is responsible for the immunoglobulins bind to its specific chains that form a complex with ability to recognize and kill target oells enhanced secondary response to an epitope, and in order to be activated, it antigens. This complex serves to tag that are considered nonself oflls. antigen and is produced via clonal $-$ may require assistance via helper foreign cells and molecules for destruction by phagocytes and destruction by phagocy

complement.

The helping function of this cell is activated by two signals: the first signal occurs with the binding of the $T$ cell receptor $($TCR$)$ to a processed antigen, and the second signal is a costimulatory cytokine.

$T_H$ cell

Memory cell cells.