7199
EENs have been shown to be a very useful genetic tool for targeted genome modification and have shown great potentials in the applications in basic research , clinical therapies and agricultural utilities , and they are specifically essential for reverse genetics research in species where no other gene targeting techniques are available .
 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