Photo: Joe Carrotta/NYU Langone Health via AP. In this September 2021 photo provided by NYU Langone Health, a surgical team at the hospital in New York examines a pig kidney attached to the body of a deceased recipient for any signs of rejection. From left are Drs. Zoe A. Stewart-Lewis, Robert A. Montgomery, Bonnie E. Lonze and Jeffrey Stern. The test was a step in the decades-long quest to one day use animal organs for life-saving transplants.

Scientists temporarily attached a pig’s kidney to a human body and watched it begin to work, a small step in the decades-long quest to one day use animal organs for life-saving transplants.

Pigs have been the most recent research focus to address the organ shortage, but among the hurdles: A sugar in pig cells, foreign to the human body, causes immediate organ rejection. The kidney for this experiment came from a gene-edited animal, engineered to eliminate that sugar and avoid an immune system attack.

Image: Photo: Joe Carrotta/NYU Langone Health via AP. In this September 2021 photo provided by NYU Langone Health, a surgical team at the hospital in New York examines a pig kidney attached to the body of a deceased recipient for any signs of rejection. From left are Drs. Zoe A. Stewart-Lewis, Robert A. Montgomery, Bonnie E. Lonze and Jeffrey Stern. The test was a step in the decades-long quest to one day use animal organs for life-saving transplants.