And what that means is because we have these non polar side chain groups, these non polar side chain groups tend to pack together and aggregate. And so in the protein, these are the side chains that will point into that protein structure because they will not want to interact with the polar water molecules that are usually found in solution that are usually found in or outside that protein. So remember, inside the cells of our body and inside our body in general, our solutions are made predominantly of polar water molecules. And these proteins are usually found inside the polar molecules. And so as a result, all these amino acids that contain these hydrophobic side chain groups are going to display the hydrophobic effect and they're going to basically create this pack structure that will be found inside that protein as compared to outside. Now let's move on to the uncharged hydrophilic polar side chains.