12732
The less polar pi - surface of protein amide groups is exposed in many receptor binding sites , either as part of the backbone or in Gln / Asn side chains .
 Chemical: amide; Chemical: Gln; Chemical: Asn
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: amide; Chemical: Gln; Chemical: Asn