Condensation of chromosomes onto the nuclear membrane during prophase.
D000818:Animals; D002466:Cell Nucleolus; D002467:Cell Nucleus; D002875:Chromosomes; D046508:Culture Techniques; D003670:Deer; D005260:Female; D005347:Fibroblasts; D008297:Male; D008566:Membranes; D008854:Microscopy, Electron; D008938:Mitosis