And number three is the actual DNA replication, the DNA synthesis process. So this is one cycle of PCR and we'll see that in just a moment. There are many of these cycles that actually take place to produce the many copies of that single DNA segment that we're interested in. So let's basically break down what these three steps actually involved. And let's begin with step number one, the strand separation. So suppose we have a beaker and inside that closed beaker we basically have all these different ingredients inside a solution.