Fig. 1From: Bovine endometrial MSC: mesenchymal to epithelial transition during luteolysis and tropism to implantation niche for immunomodulationMorphology of MSCs. Pre-immortalized mesenchymal stem cell cultures at passage 0 (upper panels) and immortalized mesenchymal stem cell lines at passages 10–15 (lower panels). Phase-contrast images were acquired with × 100 magnificationBack to article page