Abstract
Spontaneous colicin A-resistant and -tolerant mutants were isolated fromCitrobacter freundii and classified in five different groups on basis of their sensitivity to bacteriocin S6 produced byKlebsiella pneumoniae. One group of colicin A-resistant mutants was extremely sensitive to ampicillin and desoxycholate; one group of colicin-A-tolerant mutants was extremely sensitive to ampicillin, desoxycholate and EDTA. One of the bacteriocin-S6-insensitive mutants showed filament formation in liquid medium.
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