19879
Virus - sized particulate adjuvants such as ISCOMs , polystyrene nanoparticles and virus - like particles have been shown to target dendritic cells , resulting in the activation of T and B cells in vivo .
 Chemical: polystyrene
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: polystyrene