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Proposed biosynthetic pathway of ABA after zeaxanthin, with positions of steps blocked in some ABA biosynthetic mutants indicated. Also shown are the major inactivation products of ABA (phaseic acid, dihydrophaseic acid, and the glucose ester of ABA) and the minor metabolites (ABA-diols, 7′-hydroxy-ABA, ABA-1′-glucoside, and glucose esters and glucosides of PA and DPA).
