小室正人:東 京大学理学 部動物学教室,東 京都文京区本郷7-3-1,〒113 1 Present address: Department of Anatomy , The Teikyo University School of Medicine, Kaga 2-11-1, Itabashiku, -T173. The ovarian tumors induced by X-ray irradiation were histologically examined in ddY/F and C3H/Tw strains of mice 15 months after irradiation. Luteomas were developed predomi nantly in ddY/F mice after whole-body irradiation and tubular aden...