Histology after tail veins intravenous injections of FITC tagged siRNA-loaded NPs (5mg/mL, 100μL) (green), mice were sacrificed and (A, D) kidney, (B, E) spleen, and (C, F) liver samples were stained for Alexa Fluor 568 phalloidin (red) and DAPI (blue). Mice were fed a high fat diet for 8 weeks along with biweekly tail vein intravenous injections of FITC-loaded NPs (5mg/mL, 100μL). Scale bar is 50 μm.