Proteins perform essential functions throughout the systems of the human body. These long chains of amino acids are critically important for:
Source: Boundless. “Types and Functions of Proteins.” Boundless Biology. Boundless, 08 Jan. 2016. Retrieved 09 Jan. 2016 from https://www.boundless.com/biology/textbooks/boundless-biology-textbook/biological-macromolecules-3/proteins-56/types-and-functions-of-proteins-302-11435/