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ERCs enhance the percentage of CD4+CD25+Foxp3+ Tregs via PD-L1 and induce the protection against colitis. Flow cytometric analysis of CD4+CD25+Foxp3+ Tregs was performed in different groups. A. Dot plot of CD4+CD25+Foxp3+ Tregs in vivo. B. Percentage of CD4+CD25+Foxp3+ Tregs in vivo (n=8 per group) and in vitro (n=6 per group). ERCs indicated ERCs-treatment. *ERCs indicated anti-PD-L1 pretreated ERCs treatment. *P<0.05.
