Phage genes involved in the formation generalized transducing particles in Salmonella--Phage P22

Phage P22-mutants with increased or decreased ability to produce transducing particles (HT-1 and NT-mutants) were submitted to mapping experiments. The gene responsible for HT-phenotype was found to be allelic to gene 3 of the P22 linkage map. For the NT-phenotype different genes were identified: gene 1 (or a new gene extremely close to it), gene 5, gene 8 and a new gene between genes 3 and 19.