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Relative prevalence of catabolic genotypes in the bulk soil, rhizosphere, and root interior at two contaminated field sites. Values for the nitroaromatic site are the average of 27 replicates taken over the course of the summer of 1998. The values for the petroleum-contaminated site are the average of 32 replicates taken in 1998 and 1999. The error bars show the standard error of the mean.
