30423
Overall , this is the first study showing DNA solution as a microneedle coating agent and demonstrating cross - protection by co - immunization with inactivated virus and DNA vaccine using coated microneedles .
 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