When these cells are called to activeduty, their extracellular armor is marked with an immune checkpoint protein, atype of "off" switch called PD1 that can be used to shut down the immuneresponse.
当这些细胞被激活，它们表面会标记一种免疫检查点蛋白，称为PD1，是“关闭”开关的一种，能够关闭免疫应答。
When these cells are called to activeduty, their extracellular armor is marked with an immune checkpoint protein, atype of "off" switch called PD1 that can be used to shut down the immuneresponse.
当这些细胞被激活，它们表面会标记一种免疫检查点蛋白，称为PD1，是“关闭”开关的一种，能够关闭免疫应答。
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