Quantitative real-time RT-PCR (QRT-PCR) verification of microarray gene expression. Both QRT-PCR (A) and microarray (B) results of the gene PTTG1(G) were presented. The experimental design was the same as the microarray experiment. The expression value for a given gene was represented as a log2 ratio of ratio of exposed versus respective control RNA. The correlation of total 13 genes across different conditions (n = 156) between the microarray and RT-PCR data was shown on Fig. 8C. Bars represent the standard errors for the average log2 ratios of biological replicates.