So essentially, we have the DNA polymerase essentially hoving over this molecule. And when this nucleotide so this is one of the dNTP nucleotides that we spoke about earlier. The dNTP molecule comes in close proximity as long as this base is complementary to this base. So we have to use the DNA template molecule to basically figure out which base is complementary to this base. And only then will this form a strong enough interaction for this to actually remain in place. And when that takes place, the RNA polymerase molecules, as well as other proteins involved and other enzymes involved, essentially catalyze the nucleophilic addition of this phosphodia bond.