The way in which a cell corrects potentially damaging or mutagenic errors in its DNA. (See mutagen.) DNA bases may be directly replaced by enzymes, or part of a strand may be replaced by enzymes using its opposite, paired strand as a template. if (window.googletag) {googletag.cmd.push(function() { googletag.display('dcomMobileSERPDisplayTopAd-300x250'); });} else {console.error('googletag not defined, dcomMobileSERPDisplayTopAd-300x250');}