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A, c ?200; b, d ?Quadri et al. BMC Cancer (2017) 17:Page 5 ofFig. 3 Photomicrographs of pancreatic cancer tissue microarray (TMA) cores of p-ERK immunohistochemical staining: a no staining for p-ERK (score 0); b weak p-ERK (score 1+) staining; c moderate p-ERK (score 2+) staining; d strong p-ERK (score 3+) staining. Magnification: a-d: ?70 cases as 2+ (58.3 ), and 16 cases as 3+ (13.3 ) (Fig. 5a).