1. Molecular Cell Biology Institute I for Anatomy University of Cologne Medical School Cologne Germany
2. Cluster of Excellence—Cellular Stress Response in Aging‐Associated Diseases (CECAD) Cologne Germany
3. Stem Cell Biology Institute for Anatomy and Cell Biology Georg‐August University Göttingen Göttingen Germany
4. Department of Anatomy and OB‐GYN/RS University of California, San Francisco San Francisco CA USA
5. Department of Dermatology and the Helen Diller Family Comprehensive Cancer Center University of California, San Francisco San Francisco CA USA