[cellular_component] catalytic step 2 spliceosome <sep> cytosol <sep> nucleus <sep> pICln-Sm protein complex <sep> post-mRNA release spliceosomal complex <sep> spliceosomal complex <sep> U1 snRNP <sep> U2 snRNP <sep> U4/U6 x U5 tri-snRNP complex