I found a commercial reagent called in vivo-jetPEI® from Polyplus-Transfection that is able to delivery mRNA in vivo. I'm planning to do an experiment with it, but I'm worry about how to synthesise mRNA and purify them clean enough to inject to living body. 
I also found a recommended Kit called HiScribe T7 High Yield RNA Synthesis Kit that can help me to synthesise mRNA but I'm not sure if I can use the final product for an in vivo injection. Anyone have any experience with it? 
Their fur colour is actually a pretty good camouflage




