3,4-Didehydroretinol may be present in human embryos/fetuses.
Sass
J O
JO
D002851:Chromatography, High Pressure Liquid; D004622:Embryo, Mammalian / Q000737:chemistry*; D005333:Fetus / Q000737:chemistry*; D006801:Humans; D014801:Vitamin A / Q000031:analogs & derivatives* / Q000032:analysis
C024366:vitamin A2; D014801:Vitamin A