Fig. 1From: NLK functions to maintain proliferation and stemness of NSCLC and is a target of metforminNLK expression is up-regulated in NSCLC tissues. a Hematoxylin and eosin staining of lung squamous cell carcinoma tissue. b, c Immunohistochemical staining for NLK, showing positive immunostaining in NSCLC tissue. Pathologic tissue section no. 3257, scale bar, 20 μm. d Hematoxylin and eosin staining of benign lung tissue. e, f Immunohistochemical staining for NLK, showing negative immunostaining in benign lung tissue. Pathologic tissue section no. 1828, scale bar, 20 μmBack to article page