Abstract
Normal mouse mammary epithelial cells from Balb/c mice were successfully cultivated on tissue culture plastic with lethally irradiated LA7 feeder cells. The feeder cells also promoted colony formation from single mouse mammary cells, and the fraction of cells that formed colonies was proportional to the density of feeder cells. The mouse mammary cells could be passaged at least 8-12 times as long as new feeder cells were added at each passage. The cells now in culture have doubled in number at least 30 times, but the in vitro lifespan is not yet known. The cultures of mouse cells maintained by this technique never became overgrown with fibroblasts and numerous domes formed in the cultures.
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