tip of an electrochemical nanosensor positioned at the invagination of the phagocytal sac of a RAW 264.7 mouse macrophage after 12 h of inhibited phagocytosis; scale bar, 10 μm.

With free-electron lasers, such as the one that will soon be operating at the Stanford Linear Accelerator Center, X-ray microscopy will eventually allow us to image dynamics of molecules on the ...