試題詳解

3. During the process of positive selection in the thymus, a developing T cell interacts with an MHC class I molecule. What is the outcome of this interaction?
(A) The T cell stops expressing CD8
(B) The T cell commits to the CD8 lineage
(C) The T cell starts rearranging its alpha chain to have two receptors
(D) The T cell differentiates into a CD4 T cell
(E) The T cell increases the expression of CD4