Chromosoma

, Volume 94, Issue 5, pp 346–352 | Cite as

Species-specific non-expression of ribosomal RNA genes in a mammalian hybrid, the mule

  • Ewald Kopp
  • Burkhard Mayr
  • Walter Schleger
Article
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Abstract

The expression of nucleolus organizer activity in diploid cells was investigated in a model system for mammalian hybrids, the horse-ass cross (mule), by means of sequential Ag-NOR and chromomycin A3/distamycin ADAPI (CDD) staining in lectin-stimulated peripheral blood lymphocytes (PBL). As a rule we found species-specific nonexpression of the horse-derived NOR chromosomes in the mule, whereas the ass-derived NOR chromosomes were active. The results of PBL interphase studies were compatible with the data gained from mitotic metaphase analyses.

Keywords

Developmental Biology Blood Lymphocyte Peripheral Blood Lymphocyte Organizer Activity Diploid Cell 
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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • Ewald Kopp
    • 1
  • Burkhard Mayr
    • 1
  • Walter Schleger
    • 1
    • 2
  1. 1.Institute for Animal Breeding and GeneticsViennaAustria
  2. 2.Ludwig Boltzmann Institute for Immunogenetic and Cytogenetic ResearchVeterinary UniversityViennaAustria

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