title: Enhanced recovery of rII mutations in the absence of selection in a ligase-negative mutant of bacteriophage T 4 .
mesh_terms: D002874:Chromosome Mapping; D003090:Coliphages / Q000201:enzymology*; D003433:Crosses, Genetic; D004926:Escherichia coli; D005838:Genotype; D008025:Ligases; D008722:Methods; D009154:Mutation; D009711:Nucleotides; D013696:Temperature; D013997:Time Factors
chemical_list: D009711:Nucleotides; D008025:Ligases