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The membrane was assembled into a bilayer microfluidic device and a human kidney proximal tubule epithelial cell line ( HK - 2 ) and primary renal proximal tubule epithelial cells ( RPTEC ) were cultured to confluency on the membrane .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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