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Expression of inhibitory immune‐checkpoint molecules (ICM) on eTregs and Tconvs in peripheral blood lymphocytes (PBL) and tumor‐infiltrating lymphocytes (TIL) from head and neck squamous cell carcinoma (HNSCC) patients. Expression of stimulatory ICM in PBL and TIL on CD8+ Tconvs (A), CD4+ Tconvs and eTregs (B) is shown for case 23. Frequencies of stimulatory ICM in each fraction were compared between PBL and TIL (C)
