5821
Human mesenchymal stem cells cultured on the manufactured scaffolds remained viable during the 7 day assessment period , with proliferation rates comparable to those observed on tissue culture polystyrene .
 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