Fig. 8. Schematic of UI and MTS24 HF compartments. Distinguishing surface marker expression profiles for 6 integrin are shown as high (H, bright green) or low (L, pale green). Two possible compartments for 6^HCD34^–Sca-1^– cells, bordering either side of the UI region (left panel) or distributed throughout the basal layer of the IFE (right panel), are shown. sd, sebaceous duct; hs, hair shaft; dp, dermal papilla.