[1] Amgen Inc, Dept Chem Res & Discovery, Thousand Oaks, CA 91320 USA
[2] Amgen Inc, Dept HTS & Mol Pharmacol, Thousand Oaks, CA 91320 USA
[3] Amgen Inc, Dept Neurosci, Thousand Oaks, CA 91320 USA
[4] Amgen Inc, Dept Mol Struct, Thousand Oaks, CA 91320 USA