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Polyethyleneimine (PEI)-g-All-trans-retinoic acid (ATRA) (designated as PRA) was synthesized as a gene carrier. ATRA at its low concentration is known to be linked to nuclear translocation and cell cycle control (either proliferation or growth arrest) depending on its binding protein in cells. The cytotoxicity of PRA conjugates was lower than that of PEI and was gradually reduced as increasing ATRA...
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