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Decreasing Programmed death‐ligand 1 expression with increasing fixation time in a cell line: 2 h (A,E) or 24 h (C,G) of fixation in formalin, and 2 h (B,F) or 24 h (D,H) of fixation in CytoLyt. A–D, SP263 CE‐IVD assay. E–H, 22C3 laboratory‐developed test.
