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GO_term: GO:0000356   

GO:0000356DefinitionFormation of a catalytic U2-type spliceosome complex containing the pre-mRNA ready to perform the first splicing reaction.
Term U2-type catalytic spliceosome formation for 1st transesterification step
U2-type catalytic spliceosome formation for first transesterification step
TypeBiological_process
Parent Instance_ofGO:0000349
Component_ofGO:0006374
Attributes_of Index Ancestor (30)
Descendent GO:0000350
GO:0000356