8888
Corroborating this hypothesis , the introduction of anti - human immunodeficiency virus drugs of the aspartic protease inhibitor - type ( HIV PIs ) have emerged as new agents for the inhibition of Saps .
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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