Processing of a precursor RNA that removes an intron and joins the flanking exons. The ribozyme experiments show one self-splicing mechanism; RNA splicing need not always be autonomous.
A segment represented in a precursor RNA that is removed by RNA splicing; the corresponding segment of a gene is also called an intron. An intron can interrupt ribosomal RNA as well as messenger RNA.
A class of introns with a conserved RNA catalytic core and a two-step RNA splicing mechanism initiated by external guanosine. Some group I introns self-splice under suitable conditions; others require protein assistance. The ribozyme body explains the Tetrahymena example.
A segment retained in the mature RNA after RNA splicing, or the corresponding segment of a gene. An exon need not encode a protein: the ribosomal RNA exons in the Tetrahymena ribozyme experiment are an example.
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