Prevalence and Characterization of Murine Leukemia Virus Contamination in Human Cell Lines
The cell lines NCI-H82 and VERO-B4 were infected with cell culture supernatant of the cell lines DEL, KELLY, KYSE-70, LCL-HO, NAMALWA.CSN/70, or NCEB-1. DNA of the infected cell lines was prepared after 44 or 45 days (dpi, days post infection). NCI-H82 and VERO-B4 were previously shown to be MLV-negative. Only the 604–642 bp bands and the 150–174 bp bands are specific for MLV contaminations determined by the outer and inner primers, respectively.