8156
Plasmid DNA binding affinity as well as particle sizes and zeta potentials of the polyplexes were examined for these PHML vectors , and their cytotoxicities were assayed with HeLa cells by CCK - 8 and lactate dehydrogenase kits .
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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:
 None