Today's medicine faces a once completely unknown problem. It is the lack of organs for transplants that save the lives of patients with incurable changes. In our country, the situation is even worse than, for example, in. in Western Europe. Many people find it hard to come to terms with donating a healthy organ of a deceased person to another person. That is why donors are more and more often sought among animals. After conducting the appropriate research, it turns out, that they are most useful for this purpose… pigs. Their internal organs are quite similar in structure to humans. Besides, these animals are easy to breed, which does not require too much cost. Another problem is the rejection of such a transplant by the human body. However, known methods of genetic engineering offer hope that this obstacle will be overcome.