A 21-year-old patient in severe kidney failure receives a kidney from his 30-year-old brother. This type of transplantation is best described by which of the following?
Allograft: transplant from one species to the same species Autograft: transplant from one region of a person to another region Isograft: transplant from one person to a genetically identical person Xenograft: transplant from one species to another species