<unk>  <unk>  is a hair restoration technique, also known as the strip procedure, where a patient's hair is transplanted in naturally occurring groups of 1 to 4 hairs, called<unk> <unk> s.<unk> <unk> s also contain sebaceous (oil) glands, nerves, a small muscle, and occasional fine vellus hairs. In<unk> , these small<unk> s allow the surgeon to safely transplant thousands of grafts in a single session, which maximizes the cosmetic impact of the procedure.<unk>  is considered an advance over older hair transplantation procedures that used larger grafts and often produced a pluggy, unnatural look. In a properly-performed<unk> <unk>  transplant, the results will mimic the way hair grows in nature and will be undetectable as a hair transplant. In recent history,<unk>  had been the most common procedure for hair restoration. As of 2017, the newer<unk> <unk>  extraction (FUE) procedure has become the most common procedure.
Follicular unit transplantation
Thymus transplantation
Spleen transplantation
Syngeneic stem cell transplantation
Autologous immune enhancement therapy
Donor lymphocyte infusion
Peripheral stem cell transplantation
Autologous stem-cell transplantation