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Figure 7 Light microscopy of a mixed culture of DsRed-labeled human mesenchymal stem cell (hMSCs) and calcein-loaded cardiomyocytes (cm) (A). Fluorescence in red channel (B), fluorescence in green channel (C). The hMSCs in contact with calcein-loaded cardiomyocytes display green fluorescence indicative of dye transfer (C), whereas hMSCs that have no contact with calcein-loaded cardiomyocytes do not fluoresce green (A through C, white arrowhead).