Phage j2, a lysogenic phage in J2, was shown to produce tiny plaques on various Vi type strains of , to be a generalized transducing phage, and to have many characteristics including a serological one in common with phage P1 of Lysogenization of various type strains with j2 or P1-group phages usually resulted in the alteration of the phage types of the strains, except that phage j2 did not cause alteration of type 53. Phage j2 transduced, at high frequencies, much larger DNA molecules (up to at least 70 megadaltons) than those known to be transduced by phage P22: this should prove useful for the genetic analysis of


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