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Proportion of 16S rRNA genes in clone libraries constructed using [13C]DNA from the three SIP incubations (50 16S rRNA gene clones per library). The names of the representative groups of clones within each OTU correspond to the initial Blastn surveys of these sequences. The number of representative clones per OTU is indicated and their phylogenetic affiliations are shown in Fig. S2 in the supplemental material.
