Now, the left handed helix is much less stable because there is more steric hindrance. There is a greater number of collisions between the Archanes of arapoli peptide. And so because of that, the energy level of the left handed helix is higher than the energy level of the right handed helix. And what that means is for the majority of the proteins that contain the alpha helix, it will be the right handed helix and not the left handed helix that will exist within that protein. So the right handed alpha helix predominates because there is less steric hindrance between the side chains on our alpha helix. Now, the final thing I'd like to mention about the alpha helix is the actual hydrogen bonding that exists between our amino groups.