4748
Comparison of the binding site sequence among Drosophila species suggests that DHR3 binding ability was gained after the melanogaster subgroup evolved , and this ability may contribute to the robust expression of this gene .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None