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