Professor of Biological Sciences at Carnegie Mellon University. Professor Rule's research is directed at understanding inter-molecular interactions in biological systems. An understanding of these interactions is required if biological systems are to be comprehended at the molecular level. The combined tools of molecular biology, NMR spectroscopy and x-ray crystallography are used to provide important information to aid in our understanding of these interactions. Our research efforts have been directed at enzyme-substrate interactions, protein-lipid interactions, antibody-antigen interactions,...