title: Implantation in the rabbit: ultrastructural features of nuclei involved in symplasm formation.
abstract: Mitoses, direct division or cell fusion are observed during symplasm formation in the rabbit uterus epithelium. These phenomenon are examined through transmission electron-microscopic studies. Two types of direct division are described: (1) nuclear scission after folding of the membrane and (2) nuclear scission by invagination of the membrane. The existence of amitoses has long been contested in mammals; the present study tends to show that direct division is not an accidental karyorrhexis but is organized at the cellular level.
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000648:ultrastructure*; D010064:Embryo Implantation; D004848:Epithelium; D005260:Female; D008938:Mitosis; D011247:Pregnancy; D011817:Rabbits / Q000502:physiology*; D013997:Time Factors; D014599:Uterus / Q000648:ultrastructure*