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
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