Acknowledgements
We thank colleagues at the FEBS ABC Special Meeting for helpful discussions. Supported, in part, by the NIH/NEI grants R01EY028203, R01EY028954, R01EY029315, P30EY019007 (Core grant), Foundation Fighting Blindness award PPA-1218-0751-COLU, and the Unrestricted funds from the Research to Prevent Blindness (RPB) to the Department of Ophthalmology, Columbia University, New York, NY, USA. Funded in part by the Intramural Program of the NIH.
Conflict of interest: None