1809
Studies on the inactivation of these properties of EGF by specific cleavage of the molecule with CNBr or proteases suggest that an intact loop composed in part by amino acid residues 20 to 31 is essential for at least some functions .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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