And in the lytic pathway, what happens is this cell basically turns into a factory that produces many of these viruses. And eventually, when the cell cannot hold all those viruses inside that cell, it will break open, it will lice, releasing all those virus to the outside. And these viruses can then go on and affect other bacterial cells. Now, how exactly can we use the lambda phages as vectors? Well, it turns out that we can actually replace this DNA molecule with the DNA molecule of choice. As long as the size of the DNA molecule that we're essentially putting in is about the same as the size of this DNA molecule found in the lambda phage.