a nuclease that releases one nucleotide at a time (serially) beginning at one of a nucleic acid
exonuclease详细解释
ex.o.nu.cle.ase n.（名词）Any of a group of enzymes that catalyze the hydrolysis of single nucleotides from the end of a DNA or RNA chain.核酸外切酶：从脱氧核糖核酸链或核糖核酸链的末端催化单核苷酸水解的一种酶
