1. University Children’s Hospital (R.W.P., C.P., H.M.S., W.F.B.), 04317 Leipzig, Germany
2. Department of Biology (J.J.S., C.S.H.), Indiana University-Purdue University, Indianapolis, Indiana 46202-5120
3. University Children’s Hospital (M.A., J.H.B.), D-48149 Münster, Germany
4. M. S. Ramaiah Medical College (P.K.), 560054 Bangalore, India
5. Children’s Hospital Regina Margherita (J.B.), 10126 Torino, Italy
6. University Children’s Hospital (E.S., E.K.), 50931 Cologne, Germany
7. Lilly Research Laboratories (W.F.B.), 22419 Bad Homburg, Germany
8. Department of Cellular and Integrative Physiology (S.J.R.), Indiana University School of Medicine, Indianapolis, Indiana 46202