Experimental Design and Method: After being medically cleared and giving informed consent, participants will receive a single dose of the radiotracer, 2 [18F]F A 85380-Injection, and will undergo a series of PET scans acquired over the next 7 hours after the injection. The PET scans will be used to determine the time course of the distribution of the injected radioactivity in those organs expected to receive the highest radiation exposure and in the brain.