The restriction map of the nuclear polyhedrosis DNA virus of Bombyx mori has been determined with the use of four restriction endonucleases: NotI, BamHI, SmaI and KpnI. 18 cleavage sites have been localized on the viral DNA. Total length of the viral DNA is about 130 kb. The fragment containing a polyhedrin gene has been localized on the map by the blot hybridization technique.
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