Those are two different molecules with the same function.

来源: 花椒 于 2018-10-02 06:54:05 [] [旧帖] [给我悄悄话] 本文已被阅读： 次 (1137 bytes)

PD-1 and CTLA-4

PD-1 is expressed on the surface of activated T cells, B cells, and macrophages. CTLA-4 is limited to T-cell. 

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