Name the cells that are released from the thymus gland. Mention how they help in immunity?

T–cells migrate to the thymus and develop.They are responsible for cellular immunity. T- cells have special receptors on their cell surfaces called T- cell receptors which are absent in B – cells. T – cells can be differentiated according to their functions into three types – killer T – cells (attack directly), helper T – cells (stimulate B – cells) and suppressor T- cells (suppress immune system). 

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