DNA-DNA hybridization experiments have shown that most, if not all, of the nucleotide sequences of the Ad 12 transforming segment, EndoR•HindIII-G fragment at the left 7.2% of Ad 12 DNA molecule, are also present in viral DNAs of Ad 18 and Ad 31, other members in human adenovirus subgroup A, and are not detectably present in viral DNAs of Ad 7 (Subgroup B) or of Ad 2 and 5 (Subgroup C).
