And once we denature them, our proteolytic enzymes can hydrolyze them via the process of hydrolysis, our catabolic reaction that breaks down these proteins. Now, our body uses 20 different types of amino acids. Now, all these 20 different types of amino acids are alpha amino acids. And alpha simply means that the residue is attached to our alpha carbon, that our group is attached to our alpha carbon with respect to our carbonyl group. Now, ten of these amino acids can actually be synthesized by our body without any problem, without actually having to ingest any type of food. But the other ten, which are known as essential amino acids, we cannot actually synthesize.