Figure 4
From: Signature proteins for the major clades of Cyanobacteria
Partial sequence alignment of heme oxygenase showing a 2 aa insert (boxed) that is uniquely present in all sequenced Prochlorococcus strains, but not found in any other cyanobacteria. This insert provides evidence that Prochlorococcus strains are monophyletic and shared a common ancestor.