2247
The purpose of this study was to determine whether persistent and high - levels of biologically active and intact recombinant human ( rHu ) prolidase could be introduced in vivo in mice using adenovirus ( Ad ) .
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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:
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