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A suppressor of UGA mutations (supU) maps near or within a cluster of ribosomal protein genes at 72 min on the Salmonella typhimurium genetic map. The suppressor is relatively inefficient, and its activity is abolished by rpsL (formerly strA) mutations. The suppressor is dominant to a wild-type supU allele. The map position of this suppressor suggests that it may owe its activity to an alteration of ribosome structure.
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