While GSEA with Pan Cancer TI-Treg signature genes ( 26 ) as a gene set shows a negative trend in the enrichment of gene expression changes in the EP2/EP4 cKO TI-Tregs, the enrichment was not so strong as we expected ( SI Appendix, Fig.
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Prostaglandin E<sub>2</sub>-EP2/EP4 signaling induces the tumor-infiltrating Treg phenotype for tumor growth.
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