Affiliation: | 1. Department of Submicroscopic Morphology, University of Nijmegen Medical School, P. O. Box 9101, 6500 HB Nijmegen, The Netherlands;2. Baylor School of Medicine, Houston, Texas, U.S.A.;3. Department of Chemical Cytology, University of Nijmegen, Toernooiveld, Nijmegen, The Netherlands |