27442
Polymers assembled into 23 nm particles with simultaneous packaging of CpG ODN and a thiolated protein antigen , ovalbumin ( ova ) .
 Chemical: CpG
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: CpG