. "Catalysis of the hydrolysis of ester linkages within deoxyribonucleic acids by creating internal breaks to yield 5'-phosphomonoesters." . . . "endodeoxyribonuclease activity, producing 5'-phosphomonoesters" . "endodeoxyribonuclease activity, producing 5' phosphomonoesters" . . . . . . . . . . . .