1. From the Laboratory for Retinal Cell Biology, Department of Ophthalmology, Center for Integrative Human Physiology (CIHP), University of Zu¨rich, Zu¨rich, Switzerland; and
2. From the Laboratory for Retinal Cell Biology, Department of Ophthalmology, Center for Integrative Human Physiology (CIHP), University of Zu¨rich, Zu¨rich, Switzerland; and2Novartis Schweiz AG, Bern, Switzerland.