51865
Later , researchers identified exactly which gene had been affected by each mutation , thereby identifying a set of genes crucial for " Drosophila " embryogenesis .
 location: Drosophila
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Drosophila 
Answer:
 location: Drosophila