But in early April, her body ‒ which had tolerated the kidney longer than any human had ever survived with an animal organ ‒ suddenly rejected it. Doctors aren't yet sure why, but it happened ...

Given the shortage of donor organs, scientists have tried for years to make animal-to-human transplants work. But "now they can edit pig genes", there's real hope – as long as the editing can ...

This animal-to-human organ transplant, or xenotransplant, was made possible through advancements in gene-editing and cloning. With insufficient human kidneys to meet the demand for transplants ...

Cells are the smallest unit of life. Cells in multicellular plants and animals are arranged into tissues, organs and organ systems. Cells. Tissues. Organs. Organ systems. And the organism itself.