1. From the Instituto de Neurobiologi´a, Universidad Nacional Auto´noma de Me´xico, Campus UNAM-Juriquilla, Quere´taro, Me´xico;
2. Hospital “Luis Sa´nchez Bulnes,” Asociacio´n para Evitar la Ceguera (APEC), Me´xico City, Me´xico; and the
3. Austrian Academy of Science, Institute for Biomedical and Aging Research, Innsbruck, Austria.