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We will present here a critical review of the successive strategies used for the selection of these nerve agent - hydrolyzing abzymes , based on hapten design , namely antibodies raised against a wide variety of transition state analogs , and eventually the strategies based on anti - idiotypic antibodies and reactibodies .
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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