7364
The designed heterotrimers were electroneutral and relied on pairing of acidic and basic residues but could not differentiate between all of the competing states and reported systems populated either multiple heterotrimer compositions or registers .
 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