An Alabama grandmother who was the first patient to receive a new kind of genetically modified pig kidney more than two months ago is now the longest surviving recipient of a pig organ.

More than 90,000 people in the U.S. are waiting for a kidney transplant. But a kidney shortage means many die on the waitlist or become too sick for a transplant. A new plan would compensate donors.

Doctors say they can boost the odds donated organs will be usable by restarting blood circulation with a pump after donors are declared dead. Critics say the procedure blurs the definition of death.

Surgeons transplanted a kidney and thymus gland from a gene-edited pig into a 54-year-old woman in an attempt to extend her life. It's the latest experimental use of animal organs in humans.