Component	Final concentration	Stock	Amount stock/ml
ATP	30 mM	100 mM	30 μl
CTP	30 mM	100 mM	30 μl
GTP	6 mM	100 mM	4 μl
UTP	30 mM	100 mM	30 μl

Add DEPC-treated water to 0.1 ml, mix, freeze in liquid nitrogen, store at −80 °C.