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Background signal from a range of controls relative to signal produced with low concentrations of rRNA. NB, NonBact probe control (nonsense probe used with all other reagents); Yeast, broad-specificity control. BO and PO are described in Materials and Methods. Relative light units represent the total integrated light output (light produced per second per well measured every 3 min for 1 h). Error bars, 95% confidence intervals.
