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Signal and ratio values for HPV controls. Box plot data for signals (A) and HPV/negative ratios (B) obtained over 14 runs for control samples containing HPV18, HPV16, and β globin. In (B) the dotted line is the ratio cutoff level of 2. The boxes cover the 25th to 75th percentiles, the lines in the boxes represent the median values and the whiskers contain approximately 95% of the data. Open circles are outliers.
