17736
Measurement of the pH - activity profile of the thialysine modified enzyme revealed that its pH optimum is shifted from 7 . 4 to 6 . 8 .
 Chemical: thialysine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: thialysine 
Answer:
 Chemical: thialysine