Jon Klein, University of Louisville (IMAGE) University of Louisville Caption An international team of researchers including Jon Klein, M.D., Ph.D., has published data in the New England Journal of Medicine identifying a new protein involved in membranous nephropathy. Credit University of Louisville Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.