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Revised biosynthesis pathway of saxitoxin [113]. Labeled spheres represent enzymes, or catalytic domains encoded by the sxt genes. Abbreviations used were, MTF: methyltransferase, ACTF: GCN-5 related acetyl transferase, ACP: acyl carrier protein, AONS: 8-amino-7-oxononanoate synthase-related domain, SAM: S-adenosyl methionine, SAH: S-adenosyl homocysteine.
