1. Diabetes Center, University of California San Francisco, San Francisco, California 94143, United States
2. Metabolic Biology Graduate Program, Department of Nutritional Science and Toxicity, University of California Berkeley, Berkeley, California 94720, United States
3. National Enterprise for NanoScience and NanoTechnology (NEST), Istituto Nanoscienze, Consiglio Nazionale delle Ricerche (CNR) and Scuola Normale Superiore Pisa, Pisa 56127, Italy
4. Biological Imaging Development CoLab, University of California San Francisco, San Francisco, California 94143, United States
5. Ophthalmic Genetics and Visual Function Branch, National Eye Institute, Bethesda, Maryland 20892-1860, United States
6. CNR, Institute of Biophysics, Via alla Cascata 56/C, Trento 38123, Italy
7. CIBIO, University of Trento, Via delle Regole 101, Trento 38123, Italy
8. Diabetes Center and Department of Medicine, Division of Endocrinology, University of California San Francisco, 513 Parnassus Avenue, Box 0534, San Francisco, California94143, United States