The presence of certain rpsL (strA) mutations in a strain of Escherichia coli that cannot synthesize putrescine or spermidine because of deletions in ornithine decarboxylase, arginine decarboxylase, and agmatine ureohydrolase, converts a partial requirement for polyamines for growth into an absolute requirement.
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Tabor et al. (1981) studied this question.
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