passages.id: split_8_test_2851_passage
passages.type: progene_text
passages.text: Highly purified exonuclease I isolated from an over - producing stain contains high levels of dRpase activity ; it catalyzes the release of deoxyribose-5-phosphate from an AP site incised with endonuclease IV of E. coli and the release of 4-hydroxy-2-pentenal-5-phosphate from an AP site incised by the AP lyase activity of endonuclease III of E. coli .