The Biophysics Collaborative Access Team (BioCAT) is an NIH P30 Mature Synchrotron Resource for Structural Biology supported national user facility that runs the Sector 18 beamline for the study of the structure and dynamics of disordered and partially ordered biological systems. Solution scattering (BioSAXS) experiments, which provide data about macromolecular conformation in solution, can be done in equilibrium or in a time-resolved mode with microsecond to second time resolution. Separation coupled modes, such as SEC-SAXS, as well as more traditional batch mode experiments, are supported for BioSAXS. Fiber diffraction patterns of exceptional quality can be obtained from complex, weakly diffracting biological systems in very short exposure times. Part of this fiber program is a unique muscle diffraction program, providing instrumentation and expertise to measure equilibrium and time-resolved patterns from both skinned and intact muscle.