A Stem Cell Registry is a database that collects and maintains information about individuals who are willing to donate their stem cells for medical purposes. These stem cells can be used to treat various diseases, including certain types of cancer and blood disorders. The registry helps match patients in need of transplants with compatible donors, increasing the chances of successful treatment. Individuals can join a stem cell registry by providing a sample of their blood or saliva, which is then tested for specific genetic markers. This information is stored securely, allowing healthcare professionals to find potential donors quickly when a patient requires a stem cell transplant.