19689
Preferentially expressed on presynaptic nerve terminals , the mGlu2 receptor negatively modulates glutamate and GABA release and is widely distributed in the brain .
 Chemical: glutamate; 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: glutamate; Chemical: GABA