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Fluorescence images showing that HUVECs cultured on tissue culture plates proliferated but didn’t form capillary networks after 2 hours (a) and 7 days (b). When HUVECs were cultured on hMSCs sheets, capillary networks were formed after 1 day (c) and 7 days (d). Scale bar represents 100 𝜇m. Adapted from Ren et al., 2014 (Ren et al., 2014), which is under the terms of the Creative Commons Attribution (CC BY 3.0)
