Thymocytes start as double negative (lacking both CD4 and CD8), then become double positive (expressing both CD4 and CD8), and finally differentiate into either CD4 positive or CD8 positive cells.

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Thymocytes Start as

Question 24

Multiple Choice

Thymocytes start as

A) double negative, become CD4 positive, then may become double negative again, become CD8 positive, and then can become double positive
B) double negative, become CD8 positive, then may become double negative again, become CD4 positive, and then can become double positive
C) double negative, become double positive, and then become either CD4 positive or CD8 positive
D) none of the above

Correct Answer: