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Furthermore , 5 - HT1B auto - and hetero - receptors regulate alcohol intake through the regulatory mechanism involving release of 5 - HT , gamma - aminobutyric acid ( GABA ) , dopamine , and glutamate is evaluated .
 alcohol, 5 - HT, gamma - aminobutyric acid, GABA, dopamine, glutamate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 alcohol, 5 - HT, gamma - aminobutyric acid, GABA, dopamine, glutamate