1. Stem Cell Therapy: Uses stem cells to regenerate damaged tissues. Commonly used stem cells include mesenchymal stem cells (MSCs) and hematopoietic stem cells (HSCs). 2. Cartilage Repair: Uses chondrocytes to repair cartilage defects, often in the knees. 3. Islet Cell Transplantation: Transplants pancreatic islet cells to treat diabetes. 4. Immune Cell Therapies: Such as CAR-T cell therapy, which uses modified T-cells to target cancer cells.