Stem cells

Researchers hope large numbers of very primitive, embryo-like structures will lead to new insights into early human development and ways to prevent miscarriages and birth defects.

A Japanese research team made immature human eggs from stem cells that were derived from human blood. The technique brings scientists a step closer to being able to mass-produce human eggs.

California alone has spent billions in state funds over the last 14 years to support stem cell research. Scientists want another round of cash. So, what exactly did voters get for their money so far?

The companies are "unscrupulous actors" marketing stem-cell treatments that have not been proved effective and may be dangerous, the FDA says. It took action against clinics in Florida and California.

This device shoots new genetic code into cells to make them change their purpose. Researchers say the chip could someday be used to treat injuries in humans. But they've got a long, long way to go.

In 2003, researchers declared a moratorium on the use of transplanted brain cells to treat Parkinson's disease. Now, armed with better cells, they're giving the approach another try.

Three patients were blinded after getting stem cells from fat at a Florida clinic. But another patient shows promise after treatment in Japanese study using induced pluripotent stem (iPS) cells.

Three patients were blinded after getting stem cells from fat at a Florida clinic. But another patient shows promise after treatment in Japanese study using induced pluripotent stem (iPS) cells.

Researchers who study developing human embryos have long limited their experimentation to lab embryos that are no more than 14 days into development. Some scientists are now pushing that boundary.

Researchers who developed a collection of human stem cells with glowing internal structures have begun sharing them with colleagues. The glow reveals the secret workings of cells.

Clinics are using stem cells to treat problems ranging from arthritis and torn tendons to paralysis and stroke. But researchers say there's no evidence that the treatments work or are safe.

The National Institutes of Health proposed lifting its moratorium on funding for research on part-animal, part-human embryos — which raises a huge dilemma, says bioethicist Insoo Hyun.