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Chemical structure of anatoxins and its biosynthetic gene (ana) cluster in the cyanobacterium Oscillatoria sp. PCC6506. Green – transporter, orange – cyclase, light blue – thioesterase, purple – oxidase, blue- adenylation protein, yellow – acyl carrier protein, red – polyketide synthase, black – transposase (adapted from Rantala-Ylinen et al., 2011; Méjean et al., 2014; Gene cluster not drawn to scale).
