Figure 2.

Simplified Biosynthetic Pathways for Three Types of Natural Product

Different colors represent different types of natural products. The colored circles mean key precursors, and the colored rectangles mean intermediates. TCA, tricarboxylic acid cycle; PPP, pentose phosphate pathway; PPA, prephenate; Ac-CoA, acetyl coenzyme A; malonyl-CoA, malonyl coenzyme A; Phe, phenylalanine; Tyr, tyrosine; p-CA, p-coumaric acid; FPP, farnesyl diphosphate; GPP, geranyl diphosphate; GGPP, geranylgeranyl pyrophosphate; BIAs, benzylisoquinoline alkaloids; MIAs, monoterpene indole alkaloids; TAs, tropane alkaloids.