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We generated human embryonic kidney ( HEK ) 293 cells stably overexpressing OATP1B1 or OATP1B1 * 15 that showed similar protein expression levels of OATP1B1 and OATP1B1 * 15 at the cell membrane as measured by liquid chromatography - tandem mass spectrometry .
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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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