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Pharmacological inhibition ( AMD3100 ) and / or siRNA transfection targeting CXCR4 significantly suppressed sphere - forming activity in A549 and A549 / GR cells , and in various non - small cell lung cancer ( NSCLC ) cell lines .
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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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