Abstract
A new set of hybrid viruses was isolated whose closed circular genomes 5-6 kB [kile base] in size, contain DNA sequences derived in part from adenovirus 2 and in part from SV40. The structure of these genomes is complex, but in the simplest case, analyzes by [Eco RI, Hind III, Hpa I, Sma I, Hha I and Bgl I] restriction endonuclease digestion and hybridization indicate that the adenovirus 2 DNA is present as a continuous block, of maximum size 2.8 kB. Different hybrids contain sequences derived from different segments of the adenovirus 2 genome.