Photonic Resonator Outcoupler Microscopy: New Tool for Live Imaging of Cell Focal Adhesions By Maeve Reilly. ¬†Published on June 01, 2018 Photonic Resonator Outcoupler Microscopy (PROM) Focal adhesions are large specialized proteins that are located in the area where a cell membrane meets the extracellular matrix (ECM), a collection of molecules surrounding the cells that provide support and regulate micromechanical signals to the cells. Examining focal adhesions […]