According to English, if the result of a kidney transplant from an animal to a person is satisfactory, then heart transplantation will soon become possible. This will help meet the growing demand for donor organs. In the UK, about 300 people are on the heart transplant waiting list, so researchers are looking for new sources of organs. Pig organs are considered the best alternative in size.
Xenotransplantation, in which parts of the body are transplanted from one species to another, has become more possible thanks to the development of genetic engineering, which makes organs suitable for use as donors. However, a number of experts believe that such a practice carries an unacceptable risk and should not be tested in people.