Time-lapse movie showing extensive dissemination of myoepithelial cells from P-cadherin null epithelium, with gradual loss of myoepithelial coverage. The cells are expressing td tomato as a membrane marker and eEGFP-actin using a keratin-14 promoter. Images were collected every 20 minutes. The image size is 350 x 350 microns. This movie is part of a group of movies that include CIL 42151-42168.