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Progesterone 5β-reductase/iridoid synthase (PRISE) in the biosynthetic pathways of iridoids and monoterpenoid indole alkaloids (MIAs), and 5β-cardenolides. Bold red lines indicate the characteristic 4-en-3-one moeity of PRISE substrates. [IPP = isopentenyl pyprophosphate, DMAPP = dimethylallyl pyrophosphate.]
