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Percentage of pyrosequencing reads representing the most abundant OTUs (more than 1% of the total number of sequences, i.e., >3000 reads) and assigned to different bacterial phylotypes. Taxonomic classification was based on comparison of sequences within the SILVA database with OTU identity threshold at 97%. More details on taxonomic assignment of OTUs analyzed is provided in Table S3. Refer to Table 1 for sample ID.
