Abstract
Particles of PBSX, a defective, noninfectious phage which is inducible from strains of Bacillus subtilis 168, contain at least seven structural proteins resolvable by sodium dodecyl sulfate polyacrylamide gel electrophoresis. Five of these proteins are associated with the phage tail and two with the phage head. An eighth protein, which also may be coded for by the PBSX prophage, has been identified in cells derepressed for PBSX replication.
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