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Katsumi Takaba, Yoshihiro Nakagawa, Seiichi Ito, Akira Yoshitake, Hideki Wanibuchi, Shoji Fukushima. "Significant induction of epithelial cell proliferation in the urinary bladders of NCI-black-reiter male rats by N-butyl-N-(4-hydroxybutyl) nitrosamine." Journal of Toxicologic Pathology 8.2 (1995) 139-143