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Attention is regulated , at least in part , by the prefrontal cortex ( PFC ) , a brain area in which pathology of gamma - aminobutyric acid ( GABA ) neurons has been consistently observed in post - mortem analysis of the brains of people with schizophrenia .
 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