4230
In vivo gene electrotransfer is of special interest since it is the most efficient non - viral strategy for gene delivery and it is worthy of low manufacturing costs , ease of realization and favorable safety profile .
 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