1. Neuroscience Center of Excellence, School of Medicine, L.S.U. Health, New Orleans, LA 70112, USA
2. NMR Laboratory, Department of Chemistry, Tulane University, New Orleans, LA 70118, USA
3. Microscopy Laboratory, Tulane University, New Orleans, LA 70118, USA
4. Department of Ophthalmology, School of Medicine, L.S.U. Health, New Orleans, LA 70112, USA