Spliceosomal introns Intron

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nuclear pre-mrna introns (spliceosomal introns) characterized specific intron sequences located @ boundaries between introns , exons. these sequences recognized spliceosomal rna molecules when splicing reactions initiated. in addition, contain branch point, particular nucleotide sequence near 3 end of intron becomes covalently linked 5 end of intron during splicing process, generating branched (lariat) intron. apart these 3 short conserved elements, nuclear pre-mrna intron sequences highly variable. nuclear pre-mrna introns longer surrounding exons.








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