57 year-old living in the US
A dying man in the US has become the first in the world to receive a pig's heart in a transplant.
57-year-old David Bennett is said to be breathing by himself - three days after receiving the genetically-modified organ.
The operation, taking place at the University of Maryland Medical Centre, lasted 7 hours.
Mr. Bennett, who has terminal heart disease, had been previously deemed too ill to receive a human heart.
It's too soon to know if the transplant will work long-term, but his surgeon Professor Bartley Griffith says it's a lifeline:
Mr. Bennett had previously said he had two options, to die, or undergo the experimental procedure.
