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GABA ( gamma - amino - butyric - acid ) is the primary inhibitory neurotransmitter in the human brain .
 GABA, gamma - amino - butyric - acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 GABA, gamma - amino - butyric - acid