Allotransplantation (allo- from the Greek meaning "other")'s the transplantation of cells, tissues, or organs, sourced from a genetically non-identical member of the same species as the recipient.. The transplant's called an allograft or allogeneic transplant or homograft. Most human tissue and organ transplants are allografts. In contrast, a transplant from another species's called a xenograft. A transplanted organ or tissue from a genetically identical donor, for example, an identical twin,'s… (More on Allotransplantation)