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Addition of NaCl also led to increased FI , an indication of structural changes of tryptophan in response to the hydrophilic environment .
 Chemical: NaCl; 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: NaCl; Chemical: tryptophan