Files in this Data Supplement:

• Supplemental file 1 - Table S1, primer table; Fig. S1 to S6, amino acid sequence alignments: Fig. S1, putative cytochrome c proteins encoded by MA3739, MM0633, and Mbur2376; Fig. S2, superoxide reductases from D. gigas and P. furiosus with the putative superoxide reductases from M. acetivorans and M. mazei; Fig. S3; Isf from M. thermophila with Isf from M. acetivorans, M. mazei, M. barkeri, and M. burtonii; Fig. S4, F420H2 oxidase from M. marburgensis and M. arboriphilus with flavoprotein A from M. acetivorans; Fig. S5, desulforedoxin from D. gigas and homologs encoded by MA4664, MMDx, and MbarDx; Fig. S6, putative di-iron proteins encoded by MA3742, MM0636, and Mbar_A0250.
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