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Macroscopic aspect of colon in rats. Control rats and those only receiving SW480 cells had no tumor formation. A colon tumor is observed in the rat treated with DMH, (group iii), whereas 3 tumors are observed in a rat receiving both DMH and SW480 cells (group iv). The inferior panel shows representative pictures of a rat from group iv (DMH+SW480 cells) showing extensive peritoneal carcinomatosis.
