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Quantification of signals on the DNA microarray. E. coli reference strains were tested by using DNA microarray and ampliPHOX detection (see Materials and Methods section). For each spot on the microarray, the signals for each spot on the microarray were quantified and expressed as signal-to-noise ratio (SNR). Each bar represents the average SNR values ± standard deviations of three independent experiments with triplicate measurements for each probe.
