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. So lactose permeates is an example of a symporter, a cotransporter found in E. Coli cell membranes. A structure consists of two six membranespanic, alpha helices, and these are combined to form this simpler. So let's take a look at the following diagram to basically see the general idea of what it actually does.