1. Structural Biology Unit, Integrative Neuroscience Branch, NIDA IRP, NIH, Baltimore, MD, USA
2. Ionwerks Inc., Houston, TX, USA
3. Office of the Director, NIDA IRP, NIH, Baltimore, MD, USA
4. Structural Biology Unit, Cellular Neurobiology Branch, NIDA IRP, NIH, 333 Cassell Drive, 21224, Baltimore, MD, USA