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A study on the nutrient composition of beef analysed the full amino - acid profile of fifteen retail cuts from three age groups and six fat codes , as well as determined total nitrogen content to determine proximate protein composition .
 Chemical: amino - acid; Chemical: nitrogen
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: amino - acid; Chemical: nitrogen