7100
The 3C - like protease ( 3CL ( pro ) ) of coronaviruses is required for proteolytic processing of polyproteins and viral replication , and is a promising target for the development of drugs against coronaviral infection .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None