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When comparing mC with their plasmid DNA ( pDNA ) counterparts , both gave rise to similar transfection levels but cells harboring mC showed 10 % higher cell viability , maintaining 90 % of survival at least for 10 days .
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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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