As Betterhumans explains, embryonic stem cell medicine has now shown the potential to eliminate the need for genetically matched bone marrow donors. This would be a tremendous advance in the treatment of autoimmune diseases, lukemia, and similar disorders. We can hope that as more advances like this are demonstrated, politicians will find it increasingly hard to ban the technologies required for stem cell research. Regenerative medicine based on stem cells is a vital step in the process of bootstrapping towards radical life extension, and we shouldn't stand by while it is under attack. The future of our health and longevity depends on this research.