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Cells in channels after 72 h of cell co-culturing. (a) Representative fluorescence image of human umbilical vein endothelial cells (HUVECs) stained with calcein-AM with the inset showing the nuclei stained with Hoechst 33342. (b) Representative fluorescence image of BeWo cells stained with CellTracker Orange Florescent Probe with the inset showing the nuclei stained with Hoechst 33342.
