Fig. 3From: Development and Validation of Quantitative Real-Time PCR for the Detection of Residual CHO Host Cell DNA and Optimization of Sample Pretreatment Method in Biopharmaceutical ProductsThe determination of detection limit. All standards(3 fg/ul ~ 3 × 106 fg/ul) had an amplification curve with good repeatability. NC represents the negative control, NTC represents the no-template control. Horizontal lines in the figure refer to the baseline, which is determined by the software itselfBack to article page