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PHENYLALANINE OR ISOLEUCINE OR THREONINE OR GLYCINE OR LYSINE OR VALINE OR TYROSINE OR SERINE OR glutamine ACID OR ARGININE OR ALANINE OR LEUCINE OR METHIONINE OR TRYPTOPHAN OR PROLINE OR ASPARTIC ACID OR HISTIDINE
- ... hundreds or thousands of smaller units called amino acids, which are attached to one another in long chains. There are 20 different types of amino acids that can be combined to make a protein. ...