25270
Intrinsic fluorescence measurements were performed to measure exposure of tyrosine and tryptophan as a means of estimating protein conformational changes .
 Chemical: tyrosine; 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: tyrosine; Chemical: tryptophan