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Amino acids
More than 20 kinds of amino acid compose human body. They are tryptophan,methionine, threonine,valine,lysine,histidine,leucine,isoleucine,alanine,phenylalanine,cystine,cysteine, arginine,glycine,serine,tyrosine,3.5diiodothyrosine,glutamic acid,aspartic acid ,proline,hydroxyproline,citrulline,omithine and so on.
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