Fig. 2From: Vascular abnormalities and development of hypoxia in microscopic melanoma xenograftsHypoxia in microscopic tumors. a Immunohistochemical preparations of representative microscopic A-07, D-12, R-18, and U-25 window chamber tumors stained with pimonidazole to visualize hypoxia. Scale bars, 1 mm. b Fraction of pimonidazole-positive cells (HFPIM) in microscopic A-07, D-12, R-18, and U-25 window chamber tumors. Points, individual tumors; horizontal lines, meansBack to article page