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Proposed pathway for the biosynthesis of myxol-2′ fucoside. The roles of CruF, CruA, CrtR, and CruG are indicated. The order of cyclization and 1′ hydroxylation may be reversed (see Fig. S7 in the supplemental material). Compound identities: 1, lycopene; 2, 1-hydroxylycopene; 3, 1′-hydroxy-γ-carotene; 4, plectaniaxanthin; 5, myxol; and 6, myxol-2′ fucoside. The enzyme(s) for the introduction of the 3′,4′ double bond and the 2′-OH group is currently unknown.
