Figure 3From: Evidence for positive selection acting on microcystin synthetase adenylation domains in three cyanobacterial generaInformative sites in Anabaena , Microcystis and Planktothrix mcyB1C data sets. Informative sites are defined as positions with at least two different nucleotides in which each of the variants occurs at least twice. Identical nucleotides have the same colour and the colours thus display phylogenetic affinity.Back to article page