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Quantification over time of major sequences identified in clone libraries of heavy DNA from incubations with [U-13C]anthracene in feed soil (a) and [U-13C]anthraquinone in feed soil (Phenylobacterium) and treated soil (Sphingomonas) (b). Error bars represent standard deviations from triplicate qPCRs; if not visible, the error bars are within the size of the symbol. AG1, anthracene group 1.
