Reagent	Amount
10× NEBuffer 3.1	7 µl
10 mM dCTP	1.5 µl
10 mM dGTP	1.5 µl
10 mM dTTP	1.5 µl
0.4 mM biotin‐14‐dATP*	37.5 µl
Milli‐Q water	11 µl
Klenow DNA polymerase	10 µl