Phylogenetic Tree of <i>psbA</i> Gene Sequences from Representative Cultured Cyanobacterial and Cyanophage Isolates and Cloned Environmental Sequences from the Hawaii Ocean Time Series Site in the Pacific Ocean

<p>Phylogenetic tree of <i>psbA</i> gene sequences and cloned environmental sequences were collected from above (25 m, black) and below (75 m, red) the surface mixed layer at the Hawaii Ocean Time Series site in the Pacific Ocean, a region where <i>Prochlorococcus</i> are the dominant phototrophs. Details for naming conventions are as in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0040234#pbio-0040234-g001" target="_blank">Figure 1</a>. <i>Synechococcus</i> environmental “viral” sequences from [<a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0040234#pbio-0040234-b037" target="_blank">37</a>]. The tree topology was estimated by LogDet analysis of 1st and 2nd codon positions, with branch lengths estimated using stationary nucleotide frequencies.