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Functional role of TGF-β1 in NK cell receptor expression. (A) TGF-β1 was expressed in WSU-HN4- and SCC-9-derived exosomes. (B) Expression of NKG2A on NK92MI cells following stimulation with TGF-β1 for 1, 3 and 7 days. (C) Expression of NKG2D on NK92MI cells stimulated with TGF-β1 for 1, 3 and 7 days. (D) Expression of NKp30 on NK92MI cells stimulated with TGF-β1 for 1, 3 and 7 days. Receptors on NK92MI cells were detected by flow cytometry. NK, natural killer.
