Transcriptional and epigenetic features of CD62L ⁺ Tfh cells. (A) GSEA of gene sets associated with stemness, memory, mTORC1 signaling, glycolysis, apoptosis, and proliferation in Sell^hi and Pdcd1^hi clusters. (B) Chromatin regions of Pdcd1 and Sell in CD62L⁺ Tfh cells, PD-1⁺ Tfh cells, naïve CD4⁺ T cells and in vitro differentiated Tfh cells differentially accessible regions were highlighted in red.