6470
Resulting polyplexes based on ultrapure oligochitosans were slightly spherical , protected the plasmid against enzymatic digestion , and their charge and size values ranged from 8 to 14 millivolts and from 150 to 69 nm respectively depending on the N / P ratio .
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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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