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To overcome the limitations of in vitro exposure of submerged lung cells to nanoparticles ( NPs ) , we validated an integrated low flow system capable of generating and depositing airborne NPs directly onto cells at an air - liquid interface ( ALI ) .
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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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