Roche Diagnostics PCR reagents were used with following conditions: 20 μL reaction volume contained 1x PCR buffer, 3.5 mM MgCl2, 250 μM of each dNTP, 3 U FastStart Taq Polymerase, 0.5x EvaGreen Fluorescent DNA Stain (Jena Bioscience), 0.125 μM primer (Art2A) or 0.25 μM primer (BovB) and 5 pg of template DNA. Three biological replicates were prepared as templates and were analyzed in real time qPCR assays in duplicate. Polymerase chain reaction protocol was: initial denaturation at 95 °C for 10 minutes, followed by 40 cycles of 95 °C for 30 seconds, 61 °C for 15 seconds (Art2A) or 30 seconds (BovB) and 72 °C for 30 seconds. The fluorescence signal was measured at the end of each extension step. For verification of specific amplification, a melting curve analysis with a temperature gradient of 0.1 °C/s from 61 °C to 95 °C was performed. The primer specificity was verified by sequence analysis of an initial subset of PCR amplicons.