During positive selection, if the selecting MHC molecule is class I, then a. gene expression of CD8 is halted b. the thymocyte is committed to the CD8 lineage c. continued α-chain rearrangement occurs on the other locus to produce a mature T cell with two receptors d. the thymocyte differentiates into a CD4 T cell e. gene expression of CD4 is enhanced.

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