Thousands of donated organs are discarded every year. As soon as one becomes available, doctors race to find a compatible recipient—but transplantation time lines are measured in hours, and many ...

Scientists developed a way to freeze a large mammal’s kidney, which could ease organ shortages in the future. First, they had to see if their method would work in a pig. By Gina Kolata On the last day ...

Researchers generated rat sperm cells inside sterile mice using a technique called blastocyst complementation. Researchers generated rat sperm cells inside sterile mice using a technique called ...

When lab-grown clumps of human neurons are transplanted into newborn rats, they grow with the animals. The research raises some tricky ethical questions. Human neurons transplanted into a rat’s brain ...