DNA, Epithelium - pathology, Colonic Neoplasms - chemically induced, Colonic Neoplasms - genetics, Neoplasms, Rectal Neoplasms - pathology, Multiple Endocrine Neoplasia - pathology, Adenoma - chemically induced, Epithelium - physiology, Rectal Neoplasms - genetics, Experimental - chemically induced, Rectal Neoplasms - chemically induced, Cell Division - drug...