In the experiments described here fibroadenomas and adeinomas showed a definite trend to develop in older animals in association with well developed lobules w-hile c(arcinomas arose generally in younger animals from ducts and end-buds, i.e tumours arose at a time before all the end-bud regions became converted into (luctules and lobules.
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The histogenesis of mammary tumours induced in the rat by chemical carcinogens.
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