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Every Organ Teaches Its Nerves What to Become: The gut’s “second brain” has siblings inside the heart, lungs, and pancreas, and each organ builds its own small nervous system from scratch. They do so by by issuing local instructions rather than receiving them from the brain.

The gut's "second brain" has siblings inside the heart, lungs, and pancreas, and each organ builds its own small nervous system from scratch.

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