Abstract
Meeting the need Figure 1shows the imbalance between the supply and demand for organ transplants, with the largest waiting by far being for kidney transplants. Furthermore, the need for organ donors will continue to rise as more patients and new diseases are deemed eligible for treatment by transplantation. Even if opt out policies were adopted (in which people are assumed to consent unless they state otherwise) the supply of organs and tissues could not match the demand. Could xenografts bridge the gap?