7139
The protein amide ( 1 ) H ( N ) chemical shift temperature coefficient can be determined with high accuracy by recording spectra at different temperatures , but the physical mechanism responsible for this temperature dependence is not well understood .
 Chemical: ( 1 ) H ( 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: ( 1 ) H ( N )