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(A) Three typical in vivo models for evaluating the trichogenesis of isolated hair follicle cells, including the silicon chamber (a), subcutaneous injection (b), and patch implantation (c). (B) Typical combinations of various isolated hair follicle cells for in vitro trichogenesis in organotypic cultures using collagen, matrigel, or sandwiched gels. ORSKs, ORS keratinocytes; EKCs, epidermal keratinocytes. Color images available online at www.liebertonline.com/teb
