External transcribed spacer

External transcribed spacer (ETS) refers to a piece of non-functional RNA, closely related to the internal transcribed spacer, which is situated outside structural ribosomal RNAs (rRNA) on a common precursor transcript.

[1] ETS sequences characteristic to an organism can be used to trace its phylogeny.

[2] This genetics article is a stub.

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Organization of the eukaryotic nuclear ribosomal DNA tandem repeats.