id | GO:0000398   Detailed information
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  name | nuclear mRNA splicing, via spliceosome
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  namespace | biological_process
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  alt_id | GO:0006374
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  alt_id | GO:0006375
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  def | "The joining together of exons from one or more primary transcripts of nuclear messenger RNA (mRNA) and the excision of intron sequences, via a spliceosomal mechanism, so that mRNA consisting only of the joined exons is produced." [GOC:krc, ISBN:0198506732, ISBN:0879695897]
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  comment | Note that although the many U12-type introns have the sequence AT-AC at the intron termini, some introns with these terminal sequences are spliced by the U2-type spliceosome. The distinguishing characteristics are sequences near the 5' splice site and the branch point sequences of the intron. Note that although the majority of U2-type introns have the sequence GU-AG at the intron termini, some introns with these terminal sequences are spliced by the U12-type spliceosome. The distinguishing characteristics are sequences near the 5' splice site and the branch point sequences of the intron.
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  is_a | GO:0000377 ! RNA splicing, via transesterification reactions with bulged adenosine as nucleophile
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  is_a | GO:0006397 ! mRNA processing
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