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【多选题】
关于PD-1或PD-L1抗体叙述正确的是A.
PD-1 只在Ｂ细胞表面表达
B.
在肿瘤微环境中，浸润的T细胞高表达PD-1
C.
人群中PD-1表达量一样
D.
肿瘤细胞高表达 PD-1 的配体 PD-L1 和 PD-L2
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