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MS quantitation of PD-L1 peptides LQDAGVYR (LQD) and AEVIWTSSDHQVLSGK (AEV) in FFPE sections incubated in accelerated loss chamber at baseline (0), 9 and 28 days of incubation. MS, mass spectrometry; PD-L1, programmed-death-ligand-1; FFPE, formalin-fixed, paraffin embedded.
