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CD4/CD8 double-positive T cell precursors committed to the $\alpha$:$\beta$ TCR lineage are being selected in the thymus. Their engagement with self-antigen:MHC complexes within the thymus on cortical epithelial cells will determine their fate to either become CD4$^+$ or CD8$^+$ T cells.

What is this specific process called?

A

Apoptosis.

B

Negative selection.

C

Positive selection.

D

Peripheral tolerance.

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