The range of Human Random Control (HRC) DNA samples represents a control population of 480 UK Caucasian blood donors. The HRC DNA is extracted from lymphoblastoid cell lines derived by Epstein Barr Virus (EBV) that can be continuously propagated in culture. This ensures an infinite supply of the unvarying DNA panels.he range of Human Random Control (HRC) DNA samples represents a control population of 480 UK Caucasian blood donors. The HRC DNA is extracted from lymphoblastoid cell lines derived by Epstein Barr Virus (EBV) that can be continuously propagated in culture. This ensures an infinite supply of the unvarying DNA panels.