PD-L1 expressed by T cells provides backward and forward signals to restrain both innate and adaptive immune responses in tumor tissues.

中文翻译：

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PD-L1在T细胞中的双向信号与癌细胞为兄弟

T细胞表达的PD-L1提供向后和向前的信号，以抑制肿瘤组织中的先天和适应性免疫应答。