NUCLEOLAR ORGANIZER REGIONS IN THE RABBIT (ORYCTOLAGUS CUNICULUS) AS SHOWN BY SILVER STAINING

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Abstract
Nucleolar organizer regions (NOR) were demonstrated in metaphase chromosomes of the domestic rabbit. O. cuniculus (New Zealand white strain) using Ag staining. Sequential quinacrine[Q-]banding and a modification of the Ag-AS [ammoniacal silver] silver precipitation technique with duplicate photography allowed identification of silver staining NOR on the short arms of chromosomes 13, 16 and 20, and the telomeric region of the long arms of number 21 in some cells. Chromosomes 13, 16 and 20 all have subterminal to terminal centromeres, often showed satellites and secondary constrictions, and were sometimes involved in associations.