Term Name:	negative regulation of mRNA splicing, via spliceosome
Synonyms:	down regulation of nuclear mRNA splicing via U2-type spliceosome, down regulation of nuclear mRNA splicing, via spliceosome, down-regulation of nuclear mRNA splicing via U2-type spliceosome, down-regulation of nuclear mRNA splicing, via spliceosome, downregulation of nuclear mRNA splicing via U2-type spliceosome, downregulation of nuclear mRNA splicing, via spliceosome, inhibition of nuclear mRNA splicing via U2-type spliceosome, inhibition of nuclear mRNA splicing, via spliceosome, negative regulation of nuclear mRNA splicing via U2-type spliceosome, negative regulation of nuclear mRNA splicing, via spliceosome, negative regulation of pre-mRNA splicing
Definition:	Any process that stops, prevents or reduces the rate or extent of mRNA splicing via a spliceosomal mechanism.
Ontology:	GO: Biological Process [GO:0048025]    QuickGO    AmiGO