Representative Southern blot. Seven samples of genomic DNA digested with AflII (Lane A-G) or StuI (Lane H, same DNA as in G). Lane I-K = AflII digested RP11-1114 M8 BAC 1x, 3x, and 10xcopies respectively. A HERV-Fc1 env probe, B HERV-K family env probe. Only one genomic insertion is found for HERV-Fc1, whereas numerous integrated viruses are detected by the HERV-K probe.