The invention relates to a process for the in vitro preparation of a dermal papilla equivalent from fibroblasts derived from the dermal papilla and/or from the connective tissue sheath； to a process for the in vitro preparation of a hair follicle equivalent by culturing proliferative epithelial cells on said dermal papillae thus obtained； to the in vitro dermal papilla and hair follicle equivalents produced by means of the abovementioned processes, and to the uses thereof for treating alopecia and for evaluating the effect of cosmetic, pharmaceutical or dermatological products.
