Abstract
It has been assumed that the slow rate of healing in aging epidermis is due to slowing of the epidermal stem cell proliferative rate. In this issue, Charruyer et al. report that this may not be the case. Using a long-term repopulating model, they demonstrate that epidermal stem cell kinetics are maintained. Instead, it is the compensatory action of the transit-amplifying (TA) cells that changes in aging skin and thus bears responsibility for slowed wound healing.
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