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Unrooted, NJ-based tree of class VI glutaredoxins in cyanobacteria. The analysis was performed using MEGA4. Branch lengths are proportional to phylogenetic distances. The domain architecture of these Grxs is represented in the lower part of the figure. This protein is only present in most cyanobacteria of the order Synechococales but not all, and in a closely related Chroococcale, cyanobium sp. PCC7001
