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Chemical structure of saxitoxin and its biosynthetic gene cluster in the cyanobacterium Aphanizomenon sp. NH-5. Light green – transporter, white – transposase, black – unknown, dark blue – cyclase, green – polyketide synthase, light blue – oxido-reductase, orange – hydroxylase, dark red – putative regulator, orange – transferase, red – hydrolase (for details, see Kellmann et al., 2008; Mihali et al., 2009; Gene cluster not drawn to scale).
