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The nanoparticles exhibited a mean particle diameter of 73nm , zeta potential of + 3 . 5mV , anti - miR encapsulation efficiency of 88 % , and excellent colloidal stability at 4 degrees C .
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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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