Proc Natl Acad Sci U S A. 2012 Aug 21;109(34):13668-73.
Lee LM, Leung CY, Tang WW, Choi HL, Leung YC, McCaffery PJ, Wang CC, Woolf AS, Shum AS.
A paradoxical teratogenic mechanism for retinoic acid.
High-level exposure durably downregulates pathway and causes deficiency later.