I don't think they know that yet. Hair follicle cells are just specialized epidermal cells. They are hoping that the multiplied cells will recruit standard epidermal cells on the scalp once injected and cluster together to form new hair follicles. I believe they were able to do this in mice, and there has been success doing this with other cells in the body. It's just a question of if they got it right for this particular cellular process in humans.
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