And so we can produce use many identical copies of that recombinant DNA molecule of interest. Now, we can use plasma's vectors or we can also use another type of vector, another type of carrier known as a lambda phage. And a lambda phage is a special type of bacteria phage that infects E. Coli cells. So it has two types of cycles. It has the lytic life cycle and it has the lysogenic life cycle. Now, in the lytic cycle, this is the dangerous cycle that ultimately kills that cell.