13940
Although shedding of the human transferrin receptor - 1 ( TfR1 ) has been known for > 30 years and soluble TfR1 is an accepted diagnostic marker , the fate of the remaining N - terminal fragment ( NTF ) remains unknown .
 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