A number of temperature-sensitive (ts) and lysis-deficient mutants were isolated from a bacteriophage of Rhizobium meliloti. The ts mutants were grouped by complementation. Functions were classified in relation to the eclipse and latent period. A genetic map of about 40 units was derived from crosses. The genes on the chromosome of the phage are arranged in the order of their presumed functions during the phage growth. They are located on the chromosome in sequence: immunity-early-late-lysis genes.
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