10031
Elucidation of the generality and specificity of AveC - type proteins allows for the rationalization of previously published results that were not completely understood , suggesting that enzyme - mediated spiroketal formation was initially underestimated , but is , in fact , widespread in nature for the control of stereoselectivity .
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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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