20309
We observed that the E - I balance was significantly changed from 20 % E - 80 % I in WT mice to 23 % E - 77 % I in 5 - HT1AR - KO mice , demonstrating that 5 - HT1ARs contribute to the control of the balance between excitation and inhibition .
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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