Kanta Horie with Mass Spec (IMAGE) Washington University School of Medicine Caption Kanta Horie, PhD, works with a mass spectrometer that he uses to measure protein levels in cerebrospinal fluid samples. Horie and colleagues at Washington University School of Medicine in St. Louis and Lund University in Sweden have discovered that a form of the protein tau in the cerebrospinal fluid known as MTBR-tau243 can be used to track the progression of Alzheimer's disease and could speed drug development. Credit Matt Miller/Washington University Usage Restrictions This image is to be used in accordance with the mission, policies and guidelines of Washington University in St. Louis. Visit https://wustl.edu/about/compliance-policies/media-policies/multimedia-use/ for more information. License Original 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.