in the dark , a strand with a photolabile group adjacent to the 3 ' end served as a primer for synthetic template-directed dna synthesis by the klenow fragment of e. coli dna polymerase i , by bacteriophage t4 dna polymerase , and by avian myeloblastosis virus ( amv ) reverse transcriptase .
C0012888
klenow fragment
C0012892
dna polymerase