And that's the great thing about the polymerase chain reaction. So we can make many, many copies over a very short period of time and we don't even have to know what that sequence of that DNA segment is. And we can carry the entire process out in a single beaker. We don't have to even put anything in. All we have to do is we have to initially combine all these ingredients. So we basically need the primers, we need that DNA strand, we need the four types of deoxy nucleotide, five prime, triphosphates, and we need the DNA polymerase.