Now let's move on to the beta pleated sheets. We see that in the alpha helix we have this helical directionality of our polypeptide. But in the beta pleated sheets, these polymers are linear. So the polypeptide is linear and they're basically stacked on top of one another. Now, just like in the helical case, where we have two different types of alpha helixes, we have the right handed and the left handed. We also have two types of beta pleated sheets.