The procedure, performed last Friday, is a milestone in a long effort to boost the number of organs available for safe transplantation.

As the year draws to a close, we look back on researchers we bid farewell to, and the contributions they made to their respective fields.

The achievement bolsters hopes that nonhuman animals could be used to remedy the shortage of transplantable organs.

Scientists are banking various samples from recipients of donated uteruses to learn all they can about the biology of the organ, and about transplantation more generally.

With human research trials resulting in dozens of successful deliveries in the US and abroad, doctors move toward offering the surgery clinically, while working to learn all they can about uterine and transplant biology from the still-rare procedure.

Her work led to more predictable outcomes for kidney transplants.

The National Academies’ report touches on ethical issues raised by new technologies such as brain organoids and human-animal chimeras, and suggests that current regulatory oversight is sufficient.

Researchers determined that when introduced into damaged mouse or donated human livers, these lab-grown tissues could integrate into bile ducts and function normally.

Infusions of donor T cells to fight the cancer often fail, but sodium bicarbonate can counter lactic acid produced by leukemia cells, potentially improving remission rates in mice and humans.

A proof-of-concept study uses a strategy similar to the way tumors evade immune detection. The new limbs survive for more than 200 days.

Researchers can print cells and biomaterials that make up human tissues, but there’s still a long way to go before fully functional organs can be made to order.

Several early-stage clinical trials indicate that implanting patients with the cells is safe. But whether they can alleviate neurological problems remains to be seen.

The patient’s vision has improved since the procedure, and her cornea remains clear.

Scientists are devising human-animal hybrids for harvesting human organs, but lab-derived mini-organs are a less ethically fraught solution to meeting the need for transplantation.

Insulin-producing cells grown in the lab could offer a functional cure for the disease.

Primates receiving heart transplants from genetically engineered pigs have survived more than six months, a new study reveals.

Blind rats are made to see after sheets of cells implanted into their eyes make themselves at home.