RecruitingEarly Phase 1Drug trialEvaluation of [18F]GATT-44 for Positron Emission Tomography Imaging of the GABA Transporter-1Evaluate \[18F\]GATT-44 (aka \[18F\]GAT44), to characterize its pharmacokinetic, metabolic, and in vivo binding profile, and assess the reproducibility of kinetic and binding parameters. Assess specific binding levels of \[18F\]GATT-44 by conducting a test-block study in humans. Estimate human dosimetry of \[18F\]GATT-44 by performing whole-body imaging studies.