25622
Polybetaine modification of PDMS microfluidic devices to resist thrombus formation in whole blood .
 Chemical: PDMS
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: PDMS 
Answer:
 Chemical: PDMS