Term Name:	spliceosome conformational change to release U4 (or U4atac) and U1 (or U11)
Synonyms:	3'-splice site cleavage, exon ligation, spliceosomal A1 complex biosynthesis, spliceosomal A1 complex formation, spliceosomal B2 complex biosynthesis, spliceosomal B2 complex formation, U12-type spliceosome conformational change to release U4atac and U11, U2-type spliceosome conformational change to release U4 and U1
Definition:	Rearrangement of the pre-catalytic spliceosome containing U4 (or U4atac) and U1 (or U11) snRNPs to unpair U4 (or U4atac) from U6 (or U6atac) and release it from the spliceosomal complex along with U1 (or U11).
Ontology:	GO: Biological Process [GO:0000388]    QuickGO    AmiGO