Term Name:	U2-type precatalytic spliceosome
Synonyms:	GT-AG precatalytic spliceosome, major precatalytic spliceosome, mammalian U2-type spliceosomal complex B, mammalian U2-type spliceosomal complex B1, yeast U12-type spliceosomal complex A2-1
Definition:	A spliceosomal complex that is formed by the recruitment of the preassembled U4/U6.U5 tri-snRNP to the prespliceosome. Although all 5 snRNPs are present, the precatalytic spliceosome is catalytically inactive. The precatalytic spliceosome includes many proteins in addition to those found in the U1, U2 and U4/U6.U5 snRNPs.
Ontology:	GO: Cellular Component [GO:0071005]    QuickGO    AmiGO