26073
RATIONALE : Glutamatergic and gamma - aminobutyric acid ( GABA ) ergic abnormalities have recently been proposed to contribute to depression .
 gamma - aminobutyric acid, GABA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 gamma - aminobutyric acid, GABA