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Using common plastic wares ( i . e . , polyethylene films and polystyrene cell culture Petri - dishes ) , we demonstrate that these PEG - modified surfaces have a high resistance to protein adsorption and cell adhesion , while at the same time , being capable of undergoing further molecular grafting with bioactive motifs .
 Chemical: polyethylene; Chemical: polystyrene; Chemical: PEG
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: polyethylene; Chemical: polystyrene; Chemical: PEG