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Spontaneous crp mutants Escherichia coli were selected from a strain that does not require 3',5'-cyclic adenosine monophosphate for CAP activity. Several deletions of the crp gene were characterized. The crp gene was not essential for growth of E. coli. crp mutations reduced the donor ability of Hfr strains.
Sabourin et al. (Tue,) studied this question.