R 15.4 cells. To do so, we designed a modified quantitative RTPCR (RT-qPCR). Our modified method, herein named RT-DNA-qPCR (RT-DqPCR), is based on the fact that molar ratio between two genes in genomic DNA is equal (see Supplemental text 1). In short, RT-DqPCR involves normalization of values obtained by amplification of cDNA to those obtained by amplification of genomic DNA with the same primer p