23531
Here , we examined the activities of the wild - type ( WT ) enzyme and tryptophan to alanine mutant ( W40A ) enzyme , with and without the CBD , towards various substrates .
 Chemical: tryptophan; Chemical: alanine
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; Chemical: alanine