For example, these plasmids can contain genes that produce special toxins that protect the cell from other cells and other organisms. Or the plasma can contain these genes that give the cell resistance to antibiotics. Or these plasmids can contain special genes that code for special proteins, special enzymes that help the cell break down different types of products, as we'll see in just a moment. So these plasmids can essentially be engineered in a laboratory and we can insert different types of recombinant DNA molecules into these plasmids. And then we can take the plasma and place it into the cell. And when the cell replicates, it will replicate that plasma.