 Lieber has also developed nanoelectronic devices for cell/tissue electrophysiology, showing that electrical activity and action potential propagation can be recorded from cultured cardiac cells with high resolution.Most recently, Lieber realized 3D nanoscale transistors in which the active transistor is separated from the connections to the outside world.His nanotechnology-enabled 3D cellular probes have shown point-like resolution in detection of single-molecules, intracellular function and even photons.