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(A) Immunofluorescence staining of PD-L1 (green) (upper row) and the magnified images (bottom row), (B) CD8+ CTLs (red) and GzyB (green), (C) CCA3 (green), and (D) TUNEL (green) images. 4′,6-diamidino-2-phenylindole (DAPI) was used to stain cell nuclei (blue) in immunofluorescence assays.
