504
Recently , thanks to the generation of mouse genetic models , considerable progress has been made in elucidating the involvement of 4E - BPs and their unique target , eIF4E , in the process of carcinogenesis .
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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:
 None