For instance, in this particular, let's call it beaker number one, we have many copies of this lambda phage. In this beaker, we have many copies of this lambda phage. In the third beaker, we have many copies of this lambda phage and so forth. Now the great thing about these lambda phages is they can live on essentially forever, and we can use them at any time to infect other bacterial cells and produce even more copies of that particular DNA fragment. So once we create that genomic library, by the way, this is what we call a genomic library. A genomic library is basically a collection of all the different types of genes found in that particular DNA molecule of that organism.