Homograft

Allotransplants
MeSH	D014184
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Allotransplant (allo- from the Greek meaning "other") is the transplantation of cells, tissues, or organs, to a recipient from a genetically non-identical donor of the same species. The transplant is called an allograft, allogeneic transplant, or homograft. Most human tissue and organ transplants are allografts.

It is contrasted with autotransplantation (from one part of the body to another in the same person), syngeneic transplantation (grafts transplanted between two genetically identical individuals of the same species) and xenotransplantation (from other species).

Allografts can be referred to as "homostatic" if they are biologically inert when transplanted, such as bone and cartilage.

An immune response against an allograft or xenograft is termed rejection. An allogenic bone marrow transplant can result in an immune attack, called graft-versus-host disease.

Informed consent is required before tissue is harvested from a donor, alive or dead. Proper screening for pathology and risk factors for communicable diseases such as HIV and Hepatitis B and C is then conducted.

In the US, donor tissue must be harvested and processed adhering to the Current Good Tissue Practices rule. In most cases it is sent to tissue banks for processing and distribution. Each year, Food and Drug Administration regulated and American Association of Tissue Banks-accredited tissue banks distribute 1.5 million bone and tissue allografts.

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