13094
Electron transfer dissociation ( ETD ) : the mass spectrometric breakthrough essential for O - GlcNAc protein site assignments - a study of the O - GlcNAcylated protein host cell factor C1 .
 Chemical: O - GlcNAc; Chemical: O
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: O - GlcNAc, O 
Answer:
 Chemical: O - GlcNAc; Chemical: O