So it actually forms at the three end of this DNA molecule so that we have a five M that begins on this side. And likewise the other DNA primer binds until the three end of the complementary DNA molecule so that it forms at the five end. And in the next step, when we add the DNA polymerase, the DNA polymerase can bind onto this section, this section, and can basically elongate that DNA molecule. So one DNA primer binds to the three end of one strand and the other primer binds to the three end of the complementary strand. So now we increase the temperature to about 74 degrees Celsius or 72 degrees Celsius. And the reason we increase it to 72 degrees Celsius is because that is the optimal temperature of the heat resistant DNA polymerase molecule.