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—Schematic phylogeny of the IlvD family in Archaea and bacteria. Designations are the same as in figures 3–5. Collapsed branches are shown by triangles. IlvD, light blue, EDD, dark blue. Color code: Methanocellales, green; the rest of the archaea, black; bacteria, light blue. The “//” symbol indicates a long branch that is shown not to scale. Two extremely long branches are interrupted; their actual lengths are ∼2-fold greater than shown (see Supplementary Material online).
