Fig. 3.

Agarose gel electrophoresis assay of BMs–PEI–siRNA composites. a The heparin decomplexation assay. 1: Naked siRNA; 2–5: BMs–PEI–siRNA at different heparin/siRNA weight ratio: 2, 10, 25, 100, respectively; b the serum stability, 1: naked siRNA incubation with 50% FBS for 60 min; 2–5: BMs–PEI–siRNA incubation with 50% FBS for 60, 90, 120, 150 min, respectively; c the enzyme stability of BMs–PEI–siRNA: 1: naked siRNA incubation with RNase A for 60 min; 2–5: BMs–PEI–siRNA incubation with RNase A for 60, 90, 120, 150 min, respectively