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After the clearance of foreign antigen, the expanded T-cell population ________________

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After the clearance of foreign antigen, the expanded T-cell population ________________

(a) dies by apoptosis

(b) increases in size

(c) remains in the circulatory system

(d) remains in lymph nodes

I had been asked this question in an online quiz.

This intriguing question comes from Immune Response topic in section Immune Response of Cell Biology

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The correct choice is (a) dies by apoptosis

To elaborate: After the clearance of foreign antigen, the expanded T-cell population dies by apoptosis and a small population of memory T-cells remains for future contact with the same antigen.

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