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We describe here a strain of Yersinia pestis, G1670A, which exhibits a baseline mutation rate elevated 250‐fold over wild‐type Y. pestis. The responsible mutation, a C to T substitution in the mutS gene, results in the transition of a highly conserved leucine at position 689 to arginine (mutS(L689R)). When the MutSL689R protein of G1670A was expressed in a ΔmutS derivative of Y. pestis strain EV76,...