Regeneration and anatomical memory

Planaria, axolotls and frogs show that bodies know their target shape and work back to it. Levin's results — two-headed planaria that stay two-headed with unchanged DNA, frog limb regrowth with a short ion-channel drug treatment, deer antlers that remember a wound site for years — point to pattern memories that can be edited. This is the most direct path from his science to medicine.