13689
We demonstrate the preparation , purification , and characterization of the nanoparticles , then describe their resistance to treatment with endo - and exonucleases including snake - venom phosphodiesterase ( SVP ) , a common , general DNA digestion enzyme .
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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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