has part has part has_part characteristic of part of has modifier base-excision repair abnormal base-excision repair impaired DNA repair impaired base-excision repair 2025-08-21T20:03:23Z decrease or impairment in the process whereby an altered base is removed by a DNA glycosylase enzyme, followed by excision of the resulting sugar phosphate; the small gap left in the DNA helix is filled in by the sequential action of DNA polymerase and DNA ligase decreased BER MP:0014762 reduced BER abnormal decreased process quality