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Results 1 - 1 of 1 for GLYCINE OR ISOLEUCINE OR PHENYLALANINE OR THREONINE OR TYROSINE OR LYSINE OR VALINE OR SERINE OR GLUTAMIC ACID OR ARGININE OR LEUCINE OR ALANINE OR ASPARTIC ACID OR PROLINE OR TAURINE OR METHIONINE OR TRYPTOPHAN OR HISTIDINE
  1. ... 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. ...