The Chemical & Engineering News notes another group working on enhanced healing via nanofibers: researchers "combined neural stem cells [with] carbon nanofibers and injected the cocktail into damaged regions of the brains of rats that had suffered a simulated stroke. After a few weeks, [nanofibers] with stem cells promoted the growth of new neural tissue. On their own, neither nanofibers nor stem cells triggered neural tissue regeneration. Webster attributes the mixture's regenerative power to the fibers' favorable interaction with laminin, a key protein for promoting stem cell differentiation into neurons. Webster also thinks the nanofibers' ability to conduct electricity could help wire the neurons to one another." We are in the early days of discoverying practical methods for controlling and guiding the work of stem cells; present limited therapies will only get better with time.