Spliceosome

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A spliceosome is an enzyme involved in the process of transcription.  Because DNA contains a large amount of non-codin information (introns). when mRNA is transcrived it also contains non-coding information.  This is of no use to the mRNA as the non-coding information does not need to be transcribed.  The splicesome is the enzyme that splices the introns out of pre-mRNA to give the final mRNA product ready for translation.