[Structural-functional organization of the SV40 virus chromosome. II. Characteristics of viral genome containing deletion in the regulatory region].

Structure of SV40 wild type virus genome differing from the well known 776 strain has been characterized. This particular strain (SV40) was used previously for viral chromatin analysis. We show here that SV40 strain differs from 776 strain by deletion in the beginning of the "late" region (enhancer). Restriction nucleases mapping and nucleotide sequencing through this region reveal the absence of one full-length copy of 72 bp repeat.