anchorage-independent growth promotion , however , is not seen with normal mammary epithelial cells , although mtf is mitogenic for these cells as well as normal rat kidney cells , balb/c-3t3 cells , and chick embryo fibroblasts in monolayer culture , mtf is not mitogenic for primary cultures of the tumor cells from which the factors are derived .
C0007634
normal
C0016030
fibroblasts