2303
Replicate analyses did not show microheterogeneities in the fraction of peptide - N - glycosidase F cleaved and permethylated N - glycans when analyzed by matrix - assisted laser desorption ionization ( MALDI ) mass spectrometry ( MS ) .
 Chemical: N; Chemical: N
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: N; Chemical: N