Files in this Data Supplement:

• Supplemental file 1 - Electrospray ionization mass spectra of compounds eluting at 3.2 min (cytidine Fig. S1 and uridine Fig. S2) and at 3.4 min (adenosine Fig. S3 and guanosine Fig. S4); peptide masses measured from the trypsin-digested 120-kDa protein from thiosulfate-grown cultures vs predicted trypsin-digested masses of the á subunit of thiosulfate reductase (Pisl_0266) and a solute binding protein (Pisl_0913) (Table S1).
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