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Amino acids are the building blocks of proteins. They band together in chains to form proteins.It's a two-step process: Amino acids get together and form peptides or polypeptides. It is from these groupings that proteins are made. A total of 20 different kinds of amino acids forms proteins. The kinds of amino acids determine the shape of the proteins formed. Commonly recognized amino acids include glutamine, glycine, phenylalanine, tryptophan, and valine.