Scientists can keep brain organoids alive indefinitely for research purposes, but they usually “kill” the gooey blobs after three years. It is morally imperative that the scientific community keep a close eye on the evolution of brain organoids, the study said. “We don’t know if we have crossed the line, because we don’t know how to test something like this,” says Muotri. National Institute of Allergy and Infectious Diseases, NIH A close-up of a human brain organoid during development. Giordano underscores how multiple-component networks can proliferate quite fast within a brain organoid and start “communicating” with each other.