20462
The catalytic domain of TMPRSS2 was expressed in E . coli and used for an inhibitor screen with previously synthesized inhibitors of various trypsin - like serine proteases .
 Chemical: serine
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: serine