3145
The mutant which retains only the central region of the v - fos protein ( Met111 - Ile206 ) have both activities , but the mutants which have deletions in this region , and one of the mutants that has a four amino acid insertion in it , lost both activities .
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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:
 None