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Gamma glutamyl transpeptidase activity was increased up to 15 times above the upper normal limit in children , who received aminopyrine for two weeks or longer .
 Gamma glutamyl transpeptidase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Gamma glutamyl transpeptidase