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Putative biosynthesis pathway of carotenoids. The names of enzymes are abbreviated as follows: CrtB, bacterial phytoene synthase; CrtI, bacterial phytoene desaturase; PSY, phytoene synthase; PDS/CrtP, phytoene desaturase; ZDS/CrtQ, ζ-carotene desaturase; CRTISO/CrtH, carotenoid isomerase.
