Now, finally, we also have a structure known as the flagella or the flagella. And the flagella is basically the structure that allows our organism to move. Now, we're going to discuss this in a future lecture. But the flagella is different than the flagella that is found in eukaryotes. So the type of protein that our flagella is composed of inside prokaryotes is different than in eukaryotes. Now, prokaryotic organisms include two types of domains.