Well, one way to do it is by using plasmids. So remember, in any DNA molecule or in any bacterial cell, on top of having that DNA, of that bacterial cell, the bacterial cell also has these smaller DNA, smaller circular DNA known as plasmids. So let's suppose we take a bacterial cell and we isolate, we take out that plasma. So this is our plasmid of some particular DNA molecule. So this is one DNA molecule. And suppose that this is our target DNA, the recombinant DNA that we form, that we basically want to amplify.