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Gamma - aminobutyric acid ( GABA ) is a non - protein amino acid with bioactive functions in humans .
 Chemical: Gamma - aminobutyric acid; Chemical: GABA; Chemical: amino acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Gamma - aminobutyric acid; Chemical: GABA; Chemical: amino acid