The purpose of this Phase I study is to see whether a single dose of an experimental drug (meaning a drugthat is not approved by the FDA) called C2N-8E12 given into your vein (called intravenous or IV) is safeand well-tolerated in subjects with Progressive Supranuclear Palsy (PSP). C2N-8E12 is an immunotherapy (antibody) drug designed to bind to and to…