Relations between area and desoxyribonucleic acid content of the mammary gland in mice.

To the Editors: The mammary gland area(MGA)as determined by the whole mount preparation, that is, the area bounded by a line joining the periphery of the ducts, and its desoxyribonucleic acid(DNA)content have been commonly used as the indices of mammary development in mice. DNA content, which estimates the mammary parenchyma very accurately (Kirkham and Turner, 1953; Turner, 1960), of course provided no information of the morphological changes of the gland, such as width