title: Position of the nucleolus within the nuclei of pachytene spermatocytes of Dromiciops australis and Marmosa elegans (Didelphoidea-Marsupialia).
abstract: The location of the nucleoli within the nuclei of pachytene spermatocytes, and their relation with the position of the nucleolar organizer region (NOR) was studied. It appears that a terminal NOR determines a peripheral location of the nucleolus, due to the position of the NOR over the synaptonemal complex and to the attachment of the nucleolar chromosome telomeres at the nuclear membrane.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000502:physiology; D002466:Cell Nucleolus / Q000502:physiology*; D002467:Cell Nucleus / Q000502:physiology*; D002875:Chromosomes / Q000032:analysis; D008297:Male; D008394:Marsupialia; D013090:Spermatocytes / Q000502:physiology*; D013094:Spermatozoa / Q000502:physiology*