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We propose that presynaptic inhibitory mGlu7 heteroreceptors , negatively coupled to AC - dependent intraterminal pathway , exist in mouse hippocampal GABA - containing terminals , where they colocalize , but do not functionally cross - talk , with GABA ( B ) autoreceptors .
 Chemical: GABA; 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: GABA; Chemical: GABA