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Operational taxonomic units (OTUs) showing shifts towards fractions with higher buoyant density in 13C‐labelled microcosms when compared with unlabelled microcosms presented as difference between the relative abundance in 13C‐labelled and unlabelled DNA extracts from (A) soil D, (B) soil F and (C) soil W among 6 gradient fractions. Phylogenetic classification of OTUs is given in Table 2.
