Catalysis of the reaction: a 5'-end 2'-deoxyribose-2'-deoxyribonucleotide-DNA = (2E,4S)-4-hydroxypenten-2-al-5-phosphate + a 5'-end 5'-phospho-2'-deoxyribonucleoside-DNA + H+. [PMID:11251121, PMID:16120966, PMID:9614142, RHEA:76255]
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C5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function