Fig. 2From: Clinical significance of PD-L1 expression in serum-derived exosomes in NSCLC patientsRepresentative PD-L1 IHC micrographs of negative and positive tumor cells (TCs) staining. a, b PD-L1-negativity and PD-L1-positivity in TCs (100×). c, d PD-L1-negativity and PD-L1-positivity in TCs (400×)Back to article page