20458
TMPRSS2 is a multidomain type II transmembrane serine protease that cleaves the surface glycoprotein hemagglutinin ( HA ) of influenza viruses with monobasic cleavage site , which is a prerequisite for virus fusion and propagation .
 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