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The release of miRNA132 ( miR132 ) from the NPs increased 3 - fold the survival of endothelial cells ( ECs ) transplanted in vivo and 3 . 5 - fold the blood perfusion in ischemic limbs relatively to control .
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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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