Mismatch Repair
In mismatch repair, the incorrectly-added base is detected after replication. The mismatch-repair proteins detect this base and remove it from the newly-synthesized strand by nuclease action. The gap is now filled with the correctly-paired base.
Source
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"OpenStax College, Biology. November 4, 2013."
http://cnx.org/content/m44513/latest/?collection=col11448/latest
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