By 7 to 10 days, myofibroblasts lost proliferative ability and smooth muscle α - actin expression as the collagen - containing extracellular matrix and scar fully matured.
The news wasn't all bad: When Fischbach's team put obese mice on a diet, their mammary fat tissue had fewer myofibroblasts, suggesting losing weight could make a woman's fat tissue structure more normal and lower her breast cancer risk.