And the reason it slows down is because it binds well to these regions. And once it binds well, it begins the process of transcription. Now remember, RNA polymerase reads our DNA molecule from the three to five end and it synthesizes from the five to three end. And so as the RNA polymerase travels along the double strand DNA molecule it doesn't use this molecule as the template, but it uses the complementary DNA strand as the template. So if we look at the complementary strand for this particular molecule, it will basically begin on the three end and at the five end. And it's that particular DNA molecule that the RNA polymerase uses as its template.