Files in this Data Supplement:

• Supplemental file 1 - Oligonucleotides used in this study (Table S1); evolutionary distance trees based on different arsR gene sequences (Fig. S1); multiple sequence alignment of regulatory proteins (ArsR-SmtB family) from different microorganisms (Fig. S2); evolutionary distance trees based on different arsB gene sequences (Fig. S3); and evolutionary distance trees based on different arsC gene sequences (Fig. S4).
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