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We have found that pro - IGF - 2 can initially form two disulfide isomers that undergo rearrangement to a single conformation in vivo .
 GENE: pro - IGF - 2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: pro - IGF - 2