The role of single-mutant intermediates in the generation of trpAB double revertants during prolonged selection.

Abstract excerpt

Selection-induced mutations are nonrandom mutations that occur as specific, direct responses to environmental challenges and that occur more often when they are selectively advantageous than when they are selectively neutral. One of the most puzzling examples of selection-induced mutations involved the simultaneous reversions of two mutations, one in trpA and the other in trpB, at rates that were several orders...

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