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Copy number of the intact rpoB gene in DNA prepared from D. radiodurans R1 cell pellets of different thicknesses. The intact rpoB gene (887 bp) in genomic DNA was amplified and quantified by quantitative PCR (qPCR). Blue, brown and pale green bars represent 1-, 2-, and 3-year exposed samples, respectively. Each error bar shows the SEM of triplicate samples.
