VDR and alopecia: Loss ofRXRα function in skin results in multiple phenotypiccharacteristics such as alopecia, hair follicle degeneration, anddermal cysts, and although some of these phenotypiccharacteristics are similar to the loss of function of thevitamin D receptor (VDR−/−), there are abnormalitiesin epidermal proliferation and differentiation in theRXRα−/− model that are not accounted for in the VDR−/−model.