It is a medical procedure in which an organ is removed from one body and placed in the body of a recipient, to replace a damaged or missing organ. The donor and recipient may be at the same location, or organs may be transported from a donor site to another location. Organs and/or tissues that are transplanted within the same person's body are called autografts. Transplants that are recently performed between two subjects of the same species are called allografts. Allografts can either be from a living or cadaveric source. Organs that have been successfully transplanted include the heart, kidneys, liver, lungs, pancreas, intestine, and thymus. Some organs, like the brain, cannot be transplanted. Tissues include bones, tendons, corneae, skin, heart valves, nerves and veins.

Azza El Amir Professor El Amir A. M., Zoology Department, Faculty of Science, Cairo University. Specialist in Immunology since 1993. She is so interested in different subjects, specially treatment and diagnosis of diseases..