Describe a non-viral gene delivery system which can be used to deliver the functional [something] allele to stem cells.

1. Liposome-mediated gene transfer
2. Plasmid containing normal functional allele is inserted into the aqueous core of an artificial phospholipid bilayer sphere
3. The liposome fuses with the stem cell's plasma membrane, releasing the plasmid containing the normal allele into the cell's cytoplasm.