nuclease

a nuclease that cleaves nucleic acids at interior bonds and so produces fragments of various sizes

a nuclease that releases one nucleotide at a time (serially) beginning at one of a nucleic acid

any of the enzymes that cut nucleic acid at specific restriction sites and produce restriction fragments; obtained from bacteria (where they cripple viral invaders); used in recombinant DNA technology

any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions