We're going to discuss salting out. So we're going to see what salting out is, what property of proteins it uses, and then we're going to look at a specific example when we can use salting out efficiently. So let's begin by discussing what a protein is. 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.