Stanford Grows Human Brain Tissue in Mice, Filling Cortex Space

Stanford researchers report growing human nervous tissue fragments in mouse brains that, after three months, filled nearly the entire mouse cerebral cortex—a first in scale. The claim is based on a single translated news report, with no primary source cited, so the exact methodology and extent remain unverified. This raises novel ethical and regulatory questions about human-animal chimeras, potentially influencing future research guidelines.