2301
Here , TFF2 was purified from the human corpus and antrum , respectively , by size - exclusion chromatography , and the N - linked glycan structure at N - 15 of the mature peptide was determined .
 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