13099
Here , we discuss the advantages of using ETD , complimented with collisional - activation MS , in a study of the extensively O - GlcNAcylated protein Host Cell Factor C1 ( HCF - 1 ) .
 Chemical: O
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: O