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Serratia marcescens real-time quantitative PCR standard curve using plasmids of luxS gene extracted from the Db11 strain. There is only one copy of luxS per cell, and therefore each copy is indicative of one cell. The accuracy for quantifying the amount of DNA is 10 cell equivalents (CE) per reaction; however, this assay can detect as few as 3 CE per reaction. Error bars are one standard deviation from the mean (n = 3).
