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Antiserum was prepared against highly purified T4D bacteriophage-induced dihydrofolate reductase (DFR). This serum not only inactivated the enzyme but also inactivated all strains of T4D examined. T6 was inactivated to a lesser extent, and T2L, T2H, and T5 were unaffected by the antiserum. The phage-killing power of the serum could be blocked by prior incubation with partially purified T4D dfr obtained from host cells unable to make phage structural proteins. These observations confirm earlier results that the phage dfr is a structural component of the phage particle, and they offer new evidence on the manner in which this enzyme in incorporated into the tail structure.

Inactivation of T4D Bacteriophage by Antiserum Against Bacteriophage Dihydrofolate Reductase