3517
It is reportedly known that the agonist - bound active conformation of the GPCRs , such as the muscarinic acetylcholine receptor type 1 ( M ( 1 ) R ) , can be affected by the coupling of G proteins and by depolarization of the membrane potential .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None