title: Cis-trans position effect in Salmonella phage P22.
mesh_terms: D002874:Chromosome Mapping; D003433:Crosses, Genetic; D005796:Genes; D005816:Genetic Complementation Test; D005827:Genetics, Microbial; D009154:Mutation; D009876:Operon; D012483:Salmonella Phages; D012486:Salmonella typhimurium