99% of people are already immune to AA, that's an autoimmune disease that happens when the follicle loses its immunoprivileged status. A.G.A. is caused by the androgen receptor shutting down Wnt signaling. There aren't many androgen receptors in the donor area in people with DPA, which is a form of A.G.A., but some 10% of A.G.A. sufferers have DUPA, meaning their hair thins even in the donor region. Everyone has age-related thinning in all areas, even Native Americans who are not susceptible to A.G.A., but that is a completely different thing and only leads to poor quality hair, not baldness. If you remove the androgen receptor, or clone hairs that do not have it, then you get follicles that are immune to A.G.A.