<P> In molecular biology , splicing is the editing of the nascent precursor messenger RNA ( pre-mRNA ) transcript into a mature messenger RNA ( mRNA ) . After splicing , introns are removed and exons are joined together ( ligated ) . For nuclear - encoded genes , splicing takes place within the nucleus either during or immediately after transcription . For those eukaryotic genes that contain introns , splicing is usually required in order to create an mRNA molecule that can be translated into protein . For many eukaryotic introns , splicing is carried out in a series of reactions which are catalyzed by the spliceosome , a complex of snRNPs . Self - splicing introns , or ribozymes capable of catalyzing their own excision from their parent RNA molecule , also exist . </P>
<P> In molecular biology , splicing is the editing of the nascent precursor messenger RNA ( pre-mRNA ) transcript into a mature messenger RNA ( mRNA ) . After splicing , introns are removed and exons are joined together ( ligated ) . For nuclear - encoded genes , splicing takes place within the nucleus either during or immediately after transcription . For those eukaryotic genes that contain introns , splicing is usually required in order to create an mRNA molecule that can be translated into protein . For many eukaryotic introns , splicing is carried out in a series of reactions which are catalyzed by the spliceosome , a complex of snRNPs . Self - splicing introns , or ribozymes capable of catalyzing their own excision from their parent RNA molecule , also exist . </P>
where does pre mrna splicing occur in eukaryotes
where does pre mrna splicing occur in eukaryotes
spliceosome
spliceosome