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In vivo biodistribution of hUC-MSCs: a–d hUC-MSC nuclei are stained blue with DAPI, and MSCs labeled with CM-Dil show red fluorescence (e–h); a, e, i 24 h after the injection of hUC-MSCs; b, f, j 48 h after the injection of hUC-MSCs; c, g, k 7 days after the injection of hUC-MSCs; d, h, l 14 days after the injection of hUC-MSCs. Scale bar, 50 mm. m CM-Dil labeled hUC-MSCs are diabetic lungs and livers. Scale bar, 20 mm. Magnification, × 400
