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In vivo CM-Dil-labeled hUC-MSC tracing. DAPI located in the nucleus (blue), hUC-MSCs located in the cell membrane and cytoplasm (red), the superposition color of red and blue was magenta representing the living cells, and dead cells were dyed red (arrow). The number of the cells was the most on the 1st week after treatment, and the survival number decreased gradually with the extension of treatment time
