Structural Physiology Research Group was established to promote the structural biology at SPring-8 as a part of the Synchrotron Radiation Research Network. This group consists of four research teams, "Bio-multisome Research Team", "Three-dimensional Research Team", "Molecular Signaling Research Team", and "X-ray Structural Analysis Research Team". These teams envisage elucidating the dynamic aspects of the physiological functions in vivo through the structural study of membrane proteins and their multi-complex formations by the collaboration of X-ray analysis and electron/light microscopy.