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The operation, which took about nine hours to complete, was conducted on a 57-year-old man, David Bennett, at the University of Maryland Medical Center in Baltimore on Saturday.

The surgeons transplanted a genetically-modified pig’s heart into the patient’s body, Daily Mail reported on Monday.

Surgeons subjected the pig’s heart to gene-editing, in order to remove sugar in its cells that may cause the human body to reject it.

Bennett was suffering from terminal heart failure and was too sick to qualify for a human transplant. Though he knew that there was no guarantee the operation would work, the labourer had said that he would “either die or do this transplant”.

He added, “I want to live. I know it’s a shot in the dark, but it’s my last choice.”

After the operation, Bennet was able to breathe on his own though he was connected to a heart-lung machine that helped his new heart pump blood around his body.