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. 2016 Jun 24;14:188. doi: 10.1186/s12967-016-0943-4

Fig. 1.

Fig. 1

a Positive programmed cell death-ligand 1 (PD-L1) immunohistochemical staining in a patient with adenocarcinoma. b Negative PD-L1 immunohistochemical staining in another patient with adenocarcinoma