A phylogenetic compatibility matrix of mcyB1 and mcyC genes from 10 strains of toxic cyanobacteria. A phylogenetic compatibility matrix of mcyB1 and mcyC genes from 10 strains of toxic cyanobacteria. The matrix was constructed through comparing congruence between subtrees of whole alignment. At first, 67 alignment fragments were obtained by moving a 300 nucleotide window along the alignment with a step of 50 bases, and neighbor-joining tree of each fragment was constructed by PHYLIP. Then phylogenetic violations of any two different subtrees were calculated by TREEORDERSCAN (Simmonic 2005 version 1.5), and proportionally presented as a colour gradient showed in the figure. The NRPS enzymatic domains present in McyB1 and McyC are indicated: A, aminoacyl adenylation; C, condensation; T, Thiolation domain; Te, Thioesterase.