The new tool was created by taking a molecular probe used in positron emission tomography (PET) scanning for Alzheimer’s or other tau-related diseases and modifying ¬it for a new purpose. The probe, called T807, binds specifically to the abnormal tau protein. When the probe is tagged with a radioactive isotope, its binding to abnormal tau can be detected by a PET scanner, indicating the presence of disease. {read more here}