An organ transplant is an operation that places a healthy organ from one person into another. The organ can come from someone who has died (a deceased donor) and has signed their state’s donor registry or told their family of their wishes to become a donor. Up to 25 different organs can be donated for transplantation. Transplantable organs include the heart, kidneys, liver, lungs, pancreas, and small intestines. According to Donate Life America's 2011 statistics, there were 8,127 deceased organ donors and 6,017 living organ donors in the United States, adding up to 28,535 organ transplants overall. The cell memory phenomenon, while still not considered 100 percent scientifically-validated, is still supported by several scientists and physicians.