8945
Since GABA receptors ( GABA - R ) provide the main inhibitory input on dopaminergic and serotonergic neurons , drug - induced inhibition of GABA - R could contribute to higher neurotransmitter levels and thus toxicity .
 Chemical: GABA; Chemical: GABA; 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: GABA; Chemical: GABA; Chemical: GABA