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Expression of PD-L1 on human bone marrow stromal cell lines detected by immunofluorescence. Immunofluorescent staining of PD-L1 (green color) on (A) NKTert and (B) HS5 cells when monocultured or co-cultured with NKTCL cells (SNK-6 and NKYS), 600 × magnification, n = 3, *P < 0.05, **P < 0.01 by student's t-test, MOD, mean optical density; IOD, integrated optical density; AU, Arbitrary Units; MOD, IOD/Area.
