All PCR reaction mixtures were overlaid with 8 µl mineral oil. In order to visualize possible self polymerization or DNA contamination, a negative control PCR reaction with sterile distilled water in place of genomic DNA was added to the PCR series. The stability of PCR conditions was checked using a positive PCR reaction with a known DNA template and the specific forward and reverse primers producing a 620 bp product. Two independent PCR reactions were conducted for all amplifications reactions.