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Microcystin synthetase NMT DNA distance tree. Genetic distances were calculated from the alignment of a 1,319-bp region encoding the microcystin synthetase NMT region using the method of Jukes and Cantor (20). The phylogenetic tree was reconstructed using the neighbor-joining algorithm of Saitou and Nei (43) as implemented by the CLUSTAL W program (49). Local bootstrap support for branches present in more than 50% of 1,000 resamplings is indicated at each node (14).
