. "At the beginning of this reaction, 1 molecule of 'DNA containing UNG2-bound apurinic/apyrimidinic site', and 1 molecule of 'APE1' are present. At the end of this reaction, 1 molecule of 'DNA containing an APE1-bound AP site', and 1 molecule of 'UNG2' are present.

This reaction takes place in the 'nucleus'.
"^^ . . . . . "Displacement of UNG2 glycosylase by APE1 at the AP site"^^ . . . . .