We recommend using the CleanCap Reagent AG provided with this kit as the formulations have been optimized for use with this specific trinucleotide cap analog. CleanCap Reagent GG and Cleancap Reagent GG (3′ OMe) will not work with the formulations and NTPs ratios provided in this kit. TriLink does offer CleanCap Reagent AG (3′ OMe), but it has not specifically been tested with the formulations provided in this kit.