7
DPP6 is an auxiliary subunit of Kv4 and regulates the properties of Kv4 , which regulates the activity of dopaminergic neurons .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None