. "\"Any process that modulates the frequency, rate or extent of mRNA splicing via a spliceosomal mechanism.\" [GOC:jid]" . . "regulation of mRNA splicing, via spliceosome" . "regulation of nuclear mRNA splicing, via spliceosome" . . . "regulation of nuclear mRNA splicing via U2-type spliceosome" . "regulation of pre-mRNA splicing" .