Now, to demonstrate a specific example, let's take a look at a very common type of Simporter. So, co transporter that we find in the membranes of E. Coli cells. And by the way, prokaryotic organisms as well as eukaryotic organisms have these secondary transporters. But to demonstrate, we're going to look at a type of secondary transporter that we find in prokaryotic cells, equalize cells. So this is called lactose permeates. So this example we're going to look at is known as lactose permease.