1.   Although doctors have mapped the spectrum of infectious agents transmitted from human transplants, they do not know the full range of those potentially transmitted by xenografts.

2.   Animals often accept transplanted livers in the absence of the immunosuppressant drugs that are always given to human transplant patients to combat rejection of the organ.

3.   Eventually, researchers hope to use the cells to grow tissue for human transplants or to introduce new or improved genes into people.

4.   For years, scientists have been studying pigs for use in human transplants because pigs are biologically similar to humans and carry far fewer deadly diseases than primates.

5.   In addition to performing cross-species transplants, known as xenotransplantation, Reemtsma was an expert in all kinds of human transplants.

6.   Q. Some scientists are breeding animals, like pigs, in hopes of using their organs for human transplants.

7.   The hope is to stabilize the patient until a human liver transplant is found.

8.   The pump was implanted in September, when Sapos was so weak that a human transplant operation was considered too risky.

9.   They are going try and clone pigs to harvest tissue and organs for human transplant.

10.   Through cloning, scientists could mass-produce animals with organs and tissues suitable for human transplant, or improve livestock breeding.