Figure 3.

Standard curve and amplification plots obtained for single qPCR assays. (a) Reactions containing single type-specific primer pairs and probes were performed on a serial dilution of purified plasmids to generate standard curves that show a linear relationship between copy number and Ct value in a range from 2 × 10¹ to 2 × 10⁶ copies/reaction. (b) Amplification plots for each excitation/emission spectrum are shown for each reaction containing a single type-specific primer pair and probe. Arrows indicate the amplification plots for reactions containing a mixture of each HPV type-specific L1 plasmid at 2 × 10⁴ copies/reaction relative to the amplification plot corresponding to 2 × 10⁴ copies for each type-specific HPV L1 standard. Arrows in the HPV 16 and 18 type-specific L1 reactions also indicate the amplification plots of CaSki (HPV16), SiHA (HPV16) and HeLa (HPV18) genomic DNA, respectively.