Well, we can use a special enzyme, special catalytic protein known as DNA ligase. So what DNA ligase does, as we'll see in a future lecture, it basically uses ATP molecules to create phosphodiasta bonds between the fragments here and this fragment here. And so ultimately, when we mix these three fragments with DNA ligase, we produce recombinant DNA that is about the same size as this original DNA molecule that came from that lambda phage. And now we can take this DNA molecule and place it back into that lambda phage. And the lambda phage can be mixed in with our E. Coli cells. And if the environmental conditions are right, what will happen is the lythogenic cycle will be followed, and the cell will basically divide many, many times.