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Human liver prolidase , a metal - dependent dipeptidase , is being tested as a potential catalytic bioscavenger against organophosphorus ( OP ) chemical warfare nerve agents .
 Chemical: organophosphorus
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: organophosphorus