an enzymatic method for placing an n7-ethylguanine in a specific site in dna was developed using terminal deoxynucleotidyltransferase and the 3 ' to 5 ' exonuclease and 5 ' to 3 ' polymerase of the klenow fragment of escherichia coli dna polymerase i .
C0012892
polymerase
C0012888
klenow fragment