Files in this Data Supplement:

• Supplemental file 1 - DGGE fingerprinting profile of the microbiota obtained with the universal bacterial primer set 907RM/GM5-clamp from DNA extracted from zones I, II, and III (Fig. S1); primer sets and amplicon sizes used for DGGE, dilution-PCR, and clone library construction (Table S1); summary of phylogenetic affiliation and distribution of 16S rRNA gene sequences from four Fe(III)-reducing enrichment culture clone libraries (Table S2).
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