22061
Cardiac administration of the PEI1 . 8 - DA / SHP - 1 siRNA polyplexes resulted in substantial improvement in SHP - 1 gene silencing , which can be explained by the enhancement of cardiac delivery efficiency of the PEI1 . 8 - DA conjugates .
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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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