While there's maybe no medical technology today with more potential, stem cell treatments are not without their own problems. Induced pluripotent stem cells (iPSCs)
-- those created in a laboratory after being devolved from other adult cells -- are getting easier to make every day, but are still expensive to manufacture and run the risk of causing health problems of their own, possibly even becoming cancerous. Embryonic stem cells (ESCs)
, meanwhile, have been shown to be effective and largely safe for patients, but their use in medicine remains controversial. A team of researchers working at the Salk Institute
and the University of California San Diego
has taken a step toward understanding what makes both sorts of cells tick, though. They've discovered a unique molecular signature that indicates when a stem cell has been created in a lab rather than harvested from an unimplanted embryo.