1. T. M. Klauck, M. C. Faux, K. Labudda, L. K. Langeberg, J. D. Scott, Vollum Institute, Oregon Health Sciences University, 3181 Southwest Sam Jackson Park Road, Portland, OR 97201, USA.
2. S. Jaken, W. Alton Jones Cell Science Center, 10 Old Barn Road, Lake Placid, NY 12946 USA.