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The tree is unrooted and shows the relative positions of the major families in this superfamily. Six major families of genes are highlighted: minD (green), parA/soj/incC (purple), nifH (black), fleN/flhG (blue; the black branch is a clade of as yet unidentified genes), bcsQ/yhjQ (orange), and tadZ/cpaE (red). All datasets and tree files are available as supplementary information.
