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However , it remains an open question whether vertebrate Hox genes expressed under the control of Drosophila regulatory sequences can substitute the function of Drosophila Hox genes .
 GENE: vertebrate Hox genes; GENE: Drosophila Hox genes
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: vertebrate Hox genes; GENE: Drosophila Hox genes