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iNOS and VEGF immunostaining. Successive sections of three representative cancer specimens classified as grade 0 (A, iNOS; B, VEGF), grade 1 (C, iNOS; D, VEGF) and grade 2 (E, iNOS; F, VEGF). iNOS immunoreactivity was detected mainly within the cytoplasm of the tumor epithelial cells. Hematoxylin counterstain; original magnifications, ×250.
