Fig. 4From: Interactions between rat alveolar epithelial cells and bone marrow-derived mesenchymal stem cells: an in vitro co-culture modelPhospholipid staining of primary AECs cultured on a Transwell on day 21. a Primary culture of AECs alone with isolated phospholipid-positive cells indicated in green. b Separated co-culture of AECs with BMSCs induced cluster formation of phospholipid-positive cells indicated in green Back to article page