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. 2003 Dec 30;101(2):568–573. doi: 10.1073/pnas.0304489101

Fig. 3.

Fig. 3.

A maximum-likelihood tree based on the 16S rRNA gene illustrating the sporadic distribution of cyanobacterial genera known to produce microcystins (–lnL = 17594.65327). Strains of the genera Planktothrix, Microcystis, Anabaena, and Nostoc produce microcystins (▪), whereas strains of the genus Nodularia produce nodularins (•). All strains in the lineage of cyanobacteria, which originally possessed microcystin synthetase genes, are contained within a light gray box. Support for this clade is given as follows: minimum evolution with LogDet distances, minimum evolution with maximum-likelihood distances, and maximum-parsimony bootstrap values. Outgroup taxa used in the construction of this tree are not shown.