description | Protein involved in the synthesis of flavonoids, polyphenolic compounds possessing 15 carbon atoms; two benzene rings joined by a linear three carbon chain, a C6-C3-C6 skeleton. C6 presents a benzene ring, C3 often is part of of an oxygen-containing ring. Flavonoids are coloured phenolic pigments originally considered vitamins (Vitamins P, C2) but not shown to have any nutritional role. They are responsible for the red/purple colours of many higher plants |