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In most cited food composition studies and tables , the proximate system measures protein as total nitrogen ( N ) ( determined by Kjeldahl or Dumas method ) multiplied by a specific factor .
 Chemical: nitrogen; 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: nitrogen; Chemical: N