A uniform population of trinucleotides are produced in the presence of a dinucleotide initiator (such as GpA) and a ribonucleoside-triphosphate (such as GTP) encoded by the attached APC.
Adenosine triphosphate | Guanosine triphosphate | 5-alpha reductase | HMG-CoA reductase | adenosine triphosphate | Rubredoxin—NAD(P)+ reductase | Ribonucleoside-triphosphate reductase | GMP reductase | Flavanone 4-reductase | D-xylose reductase |