Genes involved in the biosynthesis of saxitoxin in cyanobacteria, their putative functional annotation, and origin

The rows are grouped based on the origin of the genes and the monophyly of the STX+ taxa for the respective gene as following: I = Cyanobacteria and not monophyletic, II = Cyanobacteria and monophyletic, III = Proteobacteria, IV = Firmicutes, V = Unknown, VI = Chimeric.