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Histopathological findings for lung tumors developed by urethane treatment. (a,b) The most aggressive lung adenocarcinoma is represented by curve no. 1 in Figure 2a,c,d. The earliest detected lung adenocarcinoma is represented by curve no. 2 in Figure 2a,e,f. One of the lung adenomas represented by a solid line is shown in Figure 2b. (a,c,e) Scale bar = 500 µm; magnification, ×100. (b,d,f) Scale bar = 200 µm; magnification, ×400.
