stem cells

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.

Seattle researchers have taken a key step toward beating back the world’s leading cause of death by regrowing damaged heart tissue in monkeys.Scientists…