Final answer:
An organ transplanted from the recipient's own body is known as an autograft. Autografts minimize the risk of rejection due to the compatibility of tissues that share the same MHC markers. Research is working towards alternatives that further reduce rejection risks.
Step-by-step explanation:
When an organ transplanted originates from the recipient, commonly done with skin grafts, it is known as an autograft. An autograft involves transplanting tissues from one area of an individual's body to another area on the same individual. Because the tissue comes from the same individual, the risk of transplant rejection is minimal. Rejection occurs when the recipient's immune system recognizes transplanted tissue as foreign or non-self and mounts an immune response. This response is based on differences in major histocompatibility complex (MHC) markers, known as human leukocyte antigens (HLAs), between donor and recipient. Current advancements in transplantation research focus on growing organs in vitro from an individual's own cells or genetically modifying donor animals to avoid the immune response.