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SUMMARY Rapidly reannealing DNA, containing repeated base sequences, was shown to be present in the genomes of four Rhizobium bacteriophages by studies of renatura- tion kinetics. Estimations of the mol. wt. of the DNA by measurement of kinetic complexity gave values of I "3 × IoS for phage c, 1.6 × lO 8 for phage I, 9"4 × lO7 for phage e and 8.2 × io 7 for phage a. Comparison of the phage DNAs by annealing studies confirmed the classification of the phages into two groups.

DNA Homology, Redundancy and Genome Size of Four Rhizobium Bacteriophages