PCR efficiency and PreAmp uniformity in PBMCs using T-PreAmp. a) Comparison of PCR efficiency of the investigated candidate gene assays calculated from PBMCs' cDNA (25 ng/μl) and 7 dilution steps (up to 1:1,024) by direct (cDNA) and T-PreAmp real-time RT-PCR (T-PreAmp). Taqman® ABI inventoried gene assays are indicated by red bars, self-designed gene assays designed by coworkers of the Charité are indicated by blue bars. b) PreAmp uniformity of the investigated candidate gene assays at 7 dilution steps from 25 ng/μl PBMCs' cDNA (1) to 1:1,024. The red bars indicate the means ± SD of the 8 reactions for each gene assay.