Sox9 is essential for outer root sheath differentiation and the formation of the hair stem cell compartment.
Vidal VP, Chaboissier MC, Lützkendorf S, Cotsarelis G, Mill P, Hui CC, Ortonne N, Ortonne JP, Schedl A. Sox9 is essential for outer root sheath differentiation and the formation of the hair stem cell compartment. Curr Biol. 2005 Aug 09; 15(15):1340-51.