**3. Chitosan as a non-viral carrier**

At present, chitosan is the most prominent of the non-viral carriers being investigated. The biomaterial, chitosan, has interested many researchers around the world, particularly in relation to its ability to be a gene delivery vehicle or the ability to modify this biopolymer for the gene delivery vehicle. This is because of its properties of biodegradability, biocompatibility, and low toxicity, and because it can be modified for increasing transfection efficiency, as well as for targeting gene delivery development.
