23428
The results suggested that UPLC / MS - based metabolic profiling of rat urine identifies impaired tryptophan metabolism as the mechanism of yeast - induced fever .
 Chemical: tryptophan
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: tryptophan