Our Analytical Ultracentrifugation (AUC) Core facility provides state of the art techniques for studying hydrodynamic properties of macromolecular complexes. Access to this facility will allows members and collaborators to characterize the properties of their macromolecular complexes, including shape, molecular weight, stoichiometry, association constants, and homogeneity. Our instrumentation includes the Beckman XL-A (UV-Vis optics) and XL-I (UV-Vis + intereference optics) analytical ultracentrifuges.