Brain Develops from Two Separate Progenitor Cells, Study Finds

Scientists at Stanford University have discovered that the human brain develops from two distinct progenitor cells, overturning the long-held belief that it originates from a single source. The research, published in the journal Nature Neuroscience on September 18, 2026, reveals that the brain forms from two separate cell lineages that evolved independently over hundreds of millions of years. The study found that during early embryonic development, two mutually exclusive progenitor cells emerge: one expressing the Otx2 gene, which gives rise to the forebrain and midbrain, and another expressing the Gbx2 gene, which forms the hindbrain. These cells have fundamentally different chromatin configurations that lock them into separate developmental paths, like travelers on parallel tracks that never cross. This discovery explains why scientists have struggled for decades to grow hindbrain neurons in the laboratory. Previous attempts likely tried to coax forebrain and midbrain progenitors into hindbrain cells, which is not possible due to their distinct origins.