“Stunned silence.” That’s how Bryan Roth of the University of North Carolina School of Medicine described the mood at a US National Institutes of Health Brain Research through Advancing Innovative Neurotechnologies (BRAIN) Initiative meeting in Bethesda, Maryland, this week when he told fellow attendees about at least seven clinical trials in China that are testing chemogenetic therapies in humans. Twenty years ago, Roth developed the chemogenetic technology the trials are using, which is based ...