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(Science: enzyme) hydrolyzes single-str&ed DNA; initiates hydrolysis at both 3' and 5' termini of such dna, yielding 5'-phosphorylated oligonucleotides averaging 4 nucleotides; can excise pyrimidine dimers which are adjacent to the break

registry number: EC 3.1.4.-

Synonym: dna repair exonuclease