These four ones shown here, we have the DNA polymerase, and we have a very small amount. So let's say about 1% of the Ddatp. So that's the specific Ddntp that we're going to choose for this specific experiment, for that specific beaker. Now, what will begin to happen? Well, what will happen is the complementary DNA primer will hybridize itself to this section here as shown in the following diagram. So this is our DNA primer.