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. 1998 Sep 7;142(5):1167–1180. doi: 10.1083/jcb.142.5.1167

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Representation of the specific probes corresponding to the X. laevis ribosomal gene (rDNA). Map of the X. laevis 40 S pre-rRNA transcription region (boxed region; rRNA coding region are black and transcribed spacer regions are white) and surrounding rDNA regions designed non transcribed spacer (NTS, black bar). The dotted line indicates the position of the hybridization probes. The rDNA probe is complementary to the entire rDNA, and the two 5′ETS and ITS1 probes are complementary to a part of the transcribed spacer regions. The 5′ETS probe extends between positions +176 and +632 relative to the transcription start site. The ITS1 probe extends between positions +2764 and +3077.