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PHENYLALANINE OR THREONINE OR GLYCINE OR ISOLEUCINE OR TYROSINE OR VALINE OR LYSINE OR SERINE OR ARGININE OR GLUTAMIC ACID OR ALANINE OR LEUCINE OR PROLINE OR TAURINE 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 ...