According to the firm's head researcher, Dr. Jan Schwab, much progress has been made in understanding what causes paralysis and possible paths to spinal-cord regeneration-paths, incidentally, that do not necessarily include the use of controversial stem cells. As he explains on the foundation's website (www.wingsforlife.com), spinal-cord injuries don't end with the initial trauma. The lesion tends to expand, damaging the neurofibers that relay information from the brain to body and limbs. Such injuries also destroy the immune system, so it is thought that preventing infection may allow neuroregeneration. It's worked in animal testing; clinical trials on humans are next.