If humans are ever going to be able to regrow damaged tissues the way lizards and fish routinely do, it will require the precise control of gene expression in time and place—otherwise you might end up with random cells growing everywhere or a new body part that never quits growing. That is, stopping the process just as important as starting it.
Gene therapy for heart attacks in mice just got more precise

A network of molecules and atoms of glass and crystals constitute a single system. 3D illustration
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