20474
P - glycoprotein ( P - gp ) , an important efflux transporter , is encoded by the MDR1 class of genes and is a central element of the multidrug resistance ( MDR ) phenomenon in cancer cells .
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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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