[biological_process] cellular response to interleukin-1 <sep> membrane protein ectodomain proteolysis <sep> mRNA splice site recognition <sep> negative regulation of mRNA splicing, via spliceosome <sep> positive regulation of mRNA splicing, via spliceosome <sep> positive regulation of transcription by RNA polymerase II <sep> protein homooligomerization <sep> regulation of alternative mRNA splicing, via spliceosome <sep> transcription by RNA polymerase II