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Amino acids are the building blocks of protein molecules. Of the numerous types of amino acids, the body requires 20 different ones, 11 of which are made in the body, 9 of which must be taken in from the food we eat so they are called the "essential amino acids". Amino acids are also important in making enzymes and some of the hormones that regulate body processes. The essential amino acids are Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan, Valine, and Histidine. The non-essential amino acids are Glycine, Glutamic acid, Arginine, Aspartic acid, Proline, Alanine, Serine, Tyrosine, Cysteine, Asparagine, Glutamine.