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Phylogenetic distribution of cyanobacterial thioredoxins. Unrooted tree of full-length Trx amino acid sequences identified in the IMG and NCBI databases. Branches are colored to represent proteins found in the different subclades: TrxA1/2 (green), TrxA3 (brown), TrxB (red), TrxQ (blue), TrxC (yellow), and TrxE (purple). The scale bar represents the number of substitutions per site. Branches related to Melainabacteria, Sericytochromatia, and Margulisbacteria are colored black.
