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Lentiviral - transduction of CXCR4 enhanced sphere formation and tumorigenicity in H460 and A549 cells , whereas introduction of siCXCR4 suppressed these activities in A549 / GR cells .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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