657
In the putamen , terminals expressing mGluR4 were evenly split between putative excitatory and inhibitory terminals , while in the GPe , most labeled terminals displayed the ultrastructural features of striatal - like inhibitory terminals , though putative excitatory boutons were also labeled .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None