22152
To prepare DNA - loaded satellite assemblies , uniform gelatin microspheres are fabricated using microfluidics , loaded with 15 base - long secondary DNA targets , capped with a polyelectrolyte bilayer , and finally coated with a monolayer of polystyrene microspheres functionalized with duplexes comprised of immobilized probes and soluble , 13 base - long hybridization partner strands .
 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