1. From the Instituto de Investigaciones Bioqui´micas de Bahi´a Blanca (INIBIBB) and Universidad Nacional del Sur (UNS), Bahi´a Blanca, Buenos Aires, Argentina; the
2. Clinical Trials Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland; and
3. Laboratoire de Biochimie Cellulaire, Universite Catholique de Louvain, Croix du Sud, Louvain-la-Neuve, Belgium.