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