So proteins are these sequences of amino acids. And inside our body, the proteins are composed of 20 different types of amino acids. Now, some of these amino acids are hydrophobic, some of them are hydrophilic. And when you place the protein into an aqueous solution, it's the hydrophilic amino acids that will be found on the surface interacting with the polar water molecules, forming hydrogen bonds, while the hydrophobic amino acids will be found inside that protein in the core. So we're basically going to get the following diagram. So this is our protein.