21366
The channel opening is orchestrated by three CG sites located in the active - site domain of the protein with one of the sites also contributing a strong attractive electrostatic potential ( ESP ) to help shuttle protons to the active site .
 None
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