Figure 2–
Representative tumour tissue preparations stained with haematoxylin–eosin corresponding to a, b) the normoxic group and c, d) animals subjected to intermittent hypoxia. a, c) whole section of the tumour, where viable tumour areas appear darker than necrotic areas. Areas marked within a square are enlarged in b) and d), respectively. a, c) Scale bars=2 mm; b, d) scale bars=200 μm.