So we add dATP dGTP dCTP and TTP. And finally, the important component in the standard died oxy method is a tiny amount of one of the four types of Ddntp molecules. Remember, we have four different types that can exist and that's because we have four different types of bases. So this base could be Adamine, it could be Guanine, it could be Cytosine, or it could be Thymine. And so we have four different types of Ggntp molecules. And in step two, we have to add a tiny amount, about 1% with respect to the other nucleoside triphosphates of a specific dig deoxy nucleuside triphosphate.