title: Maintenance of DNA and repair of sites without base.
mesh_terms: D004260:DNA Repair; D004720:Endonucleases / Q000502:physiology; D006026:Glycoside Hydrolases / Q000378:metabolism; D009154:Mutation; D011687:Purines / Q000378:metabolism*; D011743:Pyrimidines / Q000378:metabolism*
chemical_list: D011687:Purines; D011743:Pyrimidines; D004720:Endonucleases; D006026:Glycoside Hydrolases