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Immature T cells or thymocytes are undergoing positive selection in the thymus.

What cells mediate positive selection of thymocytes, and at what stage are the thymocytes in during positive selection?

A

Cortical epithelial cells: single-positive thymocytes.

B

Cortical epithelial cells: double-positive thymocytes.

C

Medullary epithelial cells: double-positive thymocytes.

D

Medullary epithelial cells: single-positive thymocytes.

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