7441
Their IC ( 50 ) values for 3 ' - end processing and strand transfer against recombinant HIV - 1IN were determined in vitro , and their cell toxicities and EC ( 50 ) against HIV - 1 were measured in cells ( ex vivo ) .
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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