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. 2015 Aug 27;10(8):e0136023. doi: 10.1371/journal.pone.0136023

Fig 1. Representative immunohistochemical staining results for PD-1 (A: normal lung tissue, negative control; B: tonsillar tissue, positive control; C: PD-1-negative tumor infiltrating lymphocytes; D: PD-1-positive tumor infiltrating lymphocytes in squamous cell carcinomas) and for PD-L1 (E: normal lung tissue, negative control; F: tonsillar tissue, positive control; G: PD-L1 negative squamous cell carcinomas; H: PD-L1 positive squamous cell carcinomas).

Fig 1

All images at x20, inlay x40.