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Listed below are a set of markers that distinguish naïve, memory, and effector T cells. Note that: CD25 = IL-2 receptor and CD127 = IL-7 receptor.

A B C
CD45RO$^+$ CD45RO$^+$ CD45RA$^+$
CD25$^{high}$ CD25$^{low}$ CD25$^{low}$
CD127$^{low}$ CD127$^{high}$ CD127$^{high}$
CD44$^{high}$ CD44$^{high}$ CD44$^{low}$
CD62L$^{low}$ CD62L$^{+/-}$ CD62L$^{high}$

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Which set represents memory T cells?

A

CD45RO$^+$
CD25$^{high}$
CD127$^{low}$
CD44$^{high}$
CD62L$^{low}$

B

CD45RO$^+$
CD25$^{low}$
CD127$^{high}$
CD44$^{high}$
CD62L$^{+/-}$

C

CD45RA$^+$
CD25$^{low}$
CD127$^{high}$
CD44$^{low}$
CD62L$^{high}$

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