Table 1
Biological activity of DNA released from DNA-PLA-PEG-NPs (n = 3)
	Untreated DNA/lipofectamine complex	Released DNA/lipofectamine complex
		1 day	10 days	20 days
Transfection efficiency (%)	51.01 ± 2.43	49.36 ± 2.83	46.95 ± 1.68	43.41 ± 2.36*

* p < 0.05 compared with untreated DNA/lipofectamine complex

Zou et al. Nanoscale Research Letters 2009 4:982   doi:10.1186/1556-276X-4-982