But in one study expected to launch later this year, scientists hope to use stem cells in a new, highly controversial way — to reverse death.

The idea of the trial, run by Philadelphia-based Bioquark, is to inject stem cells into the spinal cords of people who have been declared clinically brain-dead. The subjects will also receive an injected protein blend, electrical nerve stimulation, and laser therapy directed at the brain.

The ultimate goal: to grow new neurons and spur them to connect to each other, and thereby bring the brain back to life.

“It’s our contention that there’s no single magic bullet for this, so to start with a single magic bullet makes no sense. Hence why we have to take a different approach,” said Ira Pastor, CEO of Bioquark.