Table 1.

Amounts of HAp-PEI and siRNA with the different weight ratios.

Groups	1	2	3	4	5	6	7	8
HAp-PEI/siRNA (w/w)	/	1/1	2/1	4/1	6/1	8/1	10/1	12/1
HAp-PEI (μg)	0	2	4	8	12	16	20	24
siRNA (μg)	2	2	2	2	2	2	2	2