So, in diagram one, we extract this blue DNA, the lambda DNA molecule, as shown in the following diagram. So first we need to cut the lambda phage with a restriction enzyme. So we choose some type of restriction enzyme. And because we're talking about E. Coli cell, let's suppose we're going to use a restriction enzyme found in E. Coli cells known as ECoR one. Now, ECoR one will essentially cut our DNA of the alpha phase at two locations somewhere here and here. And we produce the following three fragments.