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PD-1 and PD-L1 expression in TMSCs. (A) The surface expression of PD-1 and PD-L1 increased after seven days of differentiation. (B) PD-L1 was expressed in the soluble medium of TMSCs (182.63 pg/mL) and the cell lysate of TMSCs (11.85 pg/protein). PD-1, programmed death 1; PD-L1, programmed death-ligand 1; TMSC, tonsil-derived mesenchymal stem cell.
