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GLYCINE OR ISOLEUCINE OR PHENYLALANINE OR THREONINE OR LYSINE OR VALINE OR SERINE OR ARGININE OR GLUTAMIC ACID OR "N-ACETYLTYROSINE" OR LEUCINE OR ALANINE OR ASPARTIC ACID OR PROLINE OR METHIONINE OR TRYPTOPHAN OR HISTIDINE
- ... The test is performed by administering the amino acid arginine in a vein to raise hGH levels. The ...