8914
Interestingly , these transcriptional effects seemed to be attenuated when Pb - exposed fish received either 100 ng / g of ORX - A ( - 70 % ) or 0 . 1 mu g / g of gamma - aminobutyric acid ( A ) receptor ( GABA ( A ) R ) agonist muscimol ( MUS ; - 97 % ) compared to fish exposed to Pb alone .
 Pb, gamma - aminobutyric acid, GABA, muscimol, MUS, Pb
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Pb, gamma - aminobutyric acid, GABA, muscimol, MUS, Pb