Figure 1C. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/j.ydbio.2006.10.032] Dev Biol 303: 66-81, Ribes V; Otto DM; Dickmann L; Schmidt K; Schuhbaur B; Henderson C; Blomhoff R; Wolf CR; Tickle C; Dolle P, "Rescue of cytochrome P450 oxidoreductase (Por) mouse mutants reveals functions in vasculogenesis, brain and limb patterning linked to retinoic acid homeostasis." Copyright 2007. [PMID:17126317]