E A Duell et al.
The Journal of investigative dermatology, 106(2), 316-320 (1996-02-01)
Application of all-trans retinoic acid to human skin for 4 d under occlusion produces a marked increase in retinoic acid 4-hydroxylase activity. In this study, the possible induction of other hydroxylase in response to 9-cis and 13-cis retinoic acid application