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The original version of this Article contained errors in Fig. 4. In panel a, the labels ‘F420-reducing NiFe hydrogenase (group 3a)’ and ‘Group 2 NiFe hydrogenase’ were misplaced. These errors have been corrected in both the PDF and HTML versions of the Article.

Author Correction: Hydrogen-based metabolism as an ancestral trait in lineages sibling to the Cyanobacteria