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The gamma - aminobutyric acid ( GABA ) A receptor is composed of a variety of subunits and combinations and shows a characteristic distribution in the CNS .
 Chemical: gamma - aminobutyric acid; Chemical: GABA
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