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Lymphocytes from five non‐tumor‐bearing male W/Fu rats infected with human adenovirus type‐9 as newborns or as adults share a common reactivity against rat mammary fibroadenoma target cells and rat mammary carcinoma target cells, as demonstrated by microcytotoxicity tests. Mammary fibroadenomas were induced by adenovirus type‐9 infection of newborn female W/Fu rats, littermates of three of the mal
