Enrichment of adenovirus-2 DNA by IGCR. (A) Electrophoretic patterns of DNA stained with ethidium bromide. DNA size markers (ΦX174-Hinc II digest, TaKaRa, Japan) are also shown. (B) Southern hybridization by a 4.7-kb Bam HI adenovirus-2 DNA fragment as the probe. Col./Taq I,Taq I-digested Columbia genomic DNA (500 ng); Ler./Taq I, Taq I-digested Landsberg erectagenomic DNA (500 ng) with a single copy adenovirus-2 DNA; Control, control subtraction sample (300 ng); IGCR, IGCR DNA sample (300 ng).