The human brain is not a single organ, but two separate systems that evolved independently before fusing together, according to groundbreaking new research. … Armed with the knowledge of how hindbrain cells uniquely form, the team has successfully turned human stem cells into becoming functional hindbrain motor neurons in a lab for the first time.



Much better article which includes links to the original paper: https://med.stanford.edu/news/all-news/2026/09/two-separate-brains.html