Tom Brady Says He Cloned His Dog

Mr. Brady became the latest celebrity to try to preserve a pet’s genetics, a move that animal rights groups have criticized.

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John B. Gurdon, 92, Dies; Nobelist Paved Way for Cloning of Animals

His work in the manipulation of cells laid the foundation for stem cell biology and regenerative medicine and led to the first cloned large mammal, a sheep named Dolly.

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For Patients Needing Transplants, Hope Arrives on Tiny Hooves

Some scientists are confident that organs from genetically modified pigs will one day be routinely transplanted into humans. But substantial ethical questions remain.

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