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Acetylcholinesterase ( AChE ) is a most remarkable protein , not only because it is one of the fastest enzymes in nature , but also since it appears in many molecular forms and is regulated by elaborate genetic networks .
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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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