Two parallel neural ectoderm progenitors contribute to the developing brain.

Two distinct neural ectoderm progenitors independently generate the forebrain/midbrain and hindbrain regions in mouse and human development.

• Why it matters: Understanding how the brain's diverse regions originate is crucial for insights into neural development and potential regenerative therapies, addressing a longstanding gap in developmental biology.
• What they did: Lineage tracing in mouse embryos and differentiation of human pluripotent stem cells into region-specific neural ectoderm revealed two parallel, lineage-restricted progenitors with distinct chromatin landscapes, including hindbrain motor neurons.
• The result: This discovery supports a model where the brain develops from two separate progenitors, a concept that may be conserved across evolution, and enables targeted generation of specific brain regions in vitro.