Fig. 7From: Biotechnological advances for improving natural pigment production: a state-of-the-art reviewSchematic for the biosynthetic pathways of tetrapyrroles. Tetrapyrroles, including vitamin B12, F430, siroheme, chlorophyll and heme, are initiated from condensation of glycine and succinyl-CoA or synthesized through C5 pathway from the C5-skeleton of glutamateBack to article page