1. From the Departments of Ophthalmology and
2. INSERM (Institut National de la Sante´ et de la Recherche Me´dicale) Unite´ 678, Paris, France; and the
3. Hematology, Hopital Pitie´-Salpe^trie`re, Paris, France;
4. Laboratory of Immunology, National Eye Institute, National Institutes of Health, Bethesda, Maryland.