Main Reaction: Beta-carotene >> retinal

Reference: PubMed ID: 24413378
Authors: Millard A, Scanlan DJ, Gallagher C, Marsh A, Taylor PC
Title: Unexpected evolutionary proximity of eukaryotic and cyanobacterial enzymes responsible for biosynthesis of retinoic acid and its oxidation.
Published: 2014 Mar 4

Beta-carotene --> retinal