DiD perchlorate is a lipophilic cyanine dye. In Vivo: Two weeks after injection of stained cells, a single, bright, DiD perchlorate (DiD)-positive cells located between 15 to 40 µm from the endosteum is found. Results reveal a progressive appearance of cell clusters of decreased dye intensity, consistent with the partitioning of DiD perchlorate label on cell division^[1].