1. Department of Cellular Biology, University of Georgia, Athens, GA 30602
2. Department of Biology, Rosenstiel Center, Brandeis University, Waltham, MA 02454
3. Department of Cell Biology, Emory University, Atlanta, GA 30303
4. Department of Biological Sciences, Dartmouth College, Hanover, NH 03755
5. Department of Biological Sciences, State University of New York, Buffalo, NY 14260
6. Department of Cell Biology, Nencki Institute of Experimental Biology, 02-093 Warsaw, Poland
7. Department of Animal Physiology, Faculty of Biology, University of Warsaw, 02-096 Warsaw, Poland
8. Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045