23035
In cytosolic proteins the cation - pi box provides a suitable receptor for choline recognition and binding through the trimethylammonium moiety .
 Chemical: choline; Chemical: trimethylammonium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: choline; Chemical: trimethylammonium