Stem Cells

TIME magazine's list of the world's 12 most prominent longevity researchers reveals where the science of life extension is heading. Also: who might make next year's list? The science of longevity, a new section.

A stem cell transplant from a donor stopped a rare autoimmune disease for more than 15 years in two patients – but this treatment is still too dangerous for most patients.

Researchers from Harvard University have grown brain tissue from stem cells, maintaining its activity for six years. The findings revealed internal "biological clocks" within nerve cells, offering new avenues for studying autism and schizophrenia.

A new study published in the journal "Nature Aging" identifies a surprising factor in how the body ages: the bone marrow. Experiments on mice revealed that as blood-producing cells age, they generate immune cells that promote chronic inflammation, which in turn damages tissues throughout the body.