Additional file 4 of Type I collagen facilitates safe and reliable expansion of human dental pulp stem cells in xenogeneic serum-free culture

Additional file 4: Figure S4. Presence of collagen types IV (COL4), VII (COL7), and fibronectin (FN) in COL-XFM and XFM cultures on day 20 post-seeding (overconfluent/multilayered state) was determined by immunohistofluorescence. The single channels (COL4, COL7, FN, and DAPI) are shown in gray and all nuclei in the merged channel are shown in magenta (DAPI). Scale bars, 100 μm.