Calibration of GATC-PCR between genomic DNA and cDNA. (A) Competitive amplification of GCN4 between genomic DNA and cDNA. (B) Standard RNAs used for competitive PCR determination of mRNA copy number. (C) Comparison of absolute amounts of eight mRNAs determined by real-time PCR and GATC-PCR. For real-time PCR, we used each GSP for the first strand cDNA synthesis. The GATC-PCR data were calibrated by the competitive PCR quantification of GCN4 mRNA using the standard RNA set (Figure 2B, Table 3).