Functional classification of P22 Amber mutants

Summary Eleven cistrons of genes active in lytic growth of phage P22 were classified by phenotypic expression of their amber mutants in nonpermissive Salmonella typhimurium. Seven cistrons code for late functions according to their lysis positive phenotype. Of the remaining four cistrons one codes for lysozym synthesis, two for phage directed DNA synthesis and one seems to be engaged in regulation of late gene expression.The majority of the experiments presented are a part of the dissertation of H. D. Dopatka submitted 1971 to the University of Göttingen.