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. 2020 May 1;11:827. doi: 10.3389/fimmu.2020.00827

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Copyright © 2020 Diao, Wang, Tan, Chen, Liu, Ning, Chen, Li, Liu, Wang, Yuan, Feng, Zhang, Wu and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Exhaustion of T cells in COVID-19 patients. (A,B) PD-1 expression on T cells in different groups; (C,D) Dynamic profile of PD-1 and TIM-3 expression on T cells in 3 patients. NS: not significant, *p < 0.05, **p < 0.01.