Biphasic pro-melanogenic and pro-apoptotic effects of all-trans-retinoic acid (ATRA) on human melanocytes: time-course study. - Baldea I; Costin GE; Shellman Y; Kechris K; Olteanu ED; Filip A; Cosgarea MR; Norris DA; Birlea SA (Journal of dermatological science, 2013)