1. Departments of Therapeutic Discovery, ‡Neuroscience, §Molecular Structure and Characterization, ∥Pharmacokinetics
and Drug Metabolism, and ⊥Comparative Biology and Safety Sciences, Amgen Inc., 360 Binney Street, Cambridge, Massachusetts 02142, One Amgen
Center Drive, Thousand Oaks, California 91320, and 1120 Veterans Boulevard,
South San Francisco, California 94080, United States