FIGURE 1.

Genomic context and phylogeny of mpeU. (A) Genomic comparison of the phycoerythrin II genomic region, ordered by PUB content. (B) Maximum likelihood phylogenetic tree of MpeU. Sequence names include Synechococcus strain names, subcluster and clades (e.g., RS9916_5.1_IX), as defined in previous studies (Scanlan et al., 2009; Farrant et al., 2016). The pigment type of each strain is indicated by a colored square. The pigment type of the two strains at the root of the tree was not formally described (3f) but is likely to be high PUB (Xia et al., 2017). Only bootstrap values higher than 70% are shown by circles at nodes, and their size is proportional to bootstrap values. The RS9916 strain used in the present study is indicated by a rectangle.