Abstract
The high rate of spontaneous mutation to streptomycin resistance (S) exhibited by the K-12 substrain CS19 was shown to involve a binary mutability system. Mutations occur at or near the same S locus, but their high frequency depends upon a remotely linked factor, Mut+. The segregation of Mut+/Mut- is well defined and is consistent with a close linkage to the L (leucine) locus.

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