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On the basis of structural analysis , the active site cavity models of P450 enzymes 1A1 and 1A2 were generated , demonstrating a planar long strip cavity and a planar triangular cavity , respectively .
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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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