Fig1F. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/j.ydbio.2006.11.035] Dev Biol 303: 601-610, Molotkova N; Molotkov A; Duester G, Role of retinoic acid during forebrain development begins late when Raldh3 generates retinoic acid in the ventral subventricular zone. Copyright 2006