Source:http://linkedlifedata.com/resource/umls/id/C1327390
GO: The chemical reactions and pathways involving retinal, a compound that plays an important role in the visual process in most vertebrates. In the retina, retinal combines with opsins to form visual pigments. Retinal is one of the forms of vitamin A. [CHEBI:15035, GOC:curators, ISBN:0198506732]