Supported in part by the National Eye Institute of the U.S.National Institutes of Health(Bethesda,MD)[No.R01EY032456(AML)],a Research to Prevent Blindness(New York,NY)grant to the Department of Ophthalmology,University of Colorado,the Frederic C.Hamilton Macular Degeneration Center(Aurora,CO),Sue Anschutz-Rodgers Eye Center Research Fund(Aurora,CO),Abrahams Research Fund,and National Center for Advancing Translational Sciences of the U.S.National Institutes of Health(Bethesda,MD). （Bethesda,MD）