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Assembled polydimethylsiloxane microfluidic devices were modified with a sulfobetaine polymer through continuous " tip - to - tip " modification , significantly reducing blood clotting and extending device patency under blood flow .
 Chemical: polydimethylsiloxane; Chemical: sulfobetaine
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: polydimethylsiloxane; Chemical: sulfobetaine