The II-1 strain of the Aleutian disease virus (ADV-II-1) was isolated from experimentally infected mink organs. The viral particles were isolated having 23 to 24 nm in diameter with the buoyant density of the virions in CsCl gradient being 1.41 g.ml-1. The single stranded ADV DNA extracted from the purified virus particles had the molecular mass about 1.4 . 10(6) (4800 bases). The double-stranded replicative form of ADV DNA has been synthesized in vitro with the use of a large "Klenow" fragment of DNA-polymerase I. A restriction endonuclease map of ADV-II-1 DNA has been constructed with the use of in vitro synthesized double-stranded DNA.
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