Definition: The intergenic DNA segments that are between the ribosomal RNA genes (internal transcribed spacers) and between the tandemly repeated units of rDNA (external transcribed spacers and nontranscribed spacers).
DNA, RIBOSOMAL and DNA, SPACER see DNA, INTERGENIC are also available
Other names Spacer DNA, Ribosomal; Ribosomal Spacer DNA