UCLA researchers have discovered a drug called DDL-920 that can repair brain damage caused by stroke in mice, by promoting the recovery of lost brain connections. The study found that physical rehabilitation after stroke improves brain function by repairing connections between neurons, and that DDL-920 can mimic this effect. The drug targets parvalbumin neurons, which help generate brain rhythms that link neurons together. Further studies are needed to understand the safety and efficacy of DDL-920 in humans.