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- ArticleHsu TW, Guntaka RV, Taylor JM.J Virol. 1978 Dec;28(3):1015-7.Circular viral DNA intermediates obtained from the quail tumor line, QT6, at 1 day after infection, were opened at one specific location by the single-strand specific nuclease, S1, of Aspergillus oryzae. This site was no longer accessible to the S1 nuclease when circles were first opened at another location with a restriction endonuclease.