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The DNA of bacteriophage T3 was characterized by cleavage with seven restriction endonucleases. AvaI, XbaI, BglII, and HindIII each cut T3 DNA at 1 site, KpnI cleaved it at 2 sites, MboI cleaved it at 9 sites, and HpaI cleaved it at 17 sites. The sizes of the fragments produced by digestion with these enzymes were determined by using restriction fragments of T7 DNA as molecular weight standards. As a result of this analysis, the size of T3 DNA was estimated to be 38.74 kilobases. The fragments were ordered with respect to each other and to the genetic map to produce a restriction map of T3 DNA. The location and occurrence of the restriction sites in T3 DNA are compared with those in the DNA of the closely related bacteriophage T7.

Derivation of a restriction map of bacteriophage T3 DNA and comparison with the map of bacteriophage T7 DNA