Catalysis of the beta-elimination of the 5' deoxyribose-5-phosphate at an abasic site in DNA where a DNA-(apurinic or apyrimidinic site) lyase has already cleaved the C-O-P bond 3' to the apurinic or apyrimidinic site. [PMID:11251121, PMID:16120966]
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C5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function