1. Department of Oral and Developmental BiologyHarvard School of Dental Medicine Boston Massachusetts USA
2. Department of MedicineUniversity of Hamburg D‐20246 Hamburg Germany
3. Department of PathologyUniversity of Hamburg Hamburg Germany
4. Department of MedicineUniversity of Hamburg Hamburg Germany
5. Schepens Eye Research InstituteDepartment of OphthalmologyHarvard Medical School Boston Massachusetts USA
6. Cardiovascular Research Division of Massachusetts General Hospital Boston Massachusetts USA
7. Novartis Institutes for Biomedical Research Cambridge MA 02139 USA