| Name | cis assembly of pre-catalytic spliceosome |
| ID | GO_0000354 |
| collection_id | Biological process |
| Alternative ID | GO:0000360, GO:0000361 |
| Description | Assembly of a spliceosomal complex containing the intact pre-mRNA and all of the spliceosomal snRNPs. This occurs when the tri-snRNP associates with the pre-mRNA and associated snRNPs in an ATP-dependent manner. |
| Comment | Note that this step represents formation of the A2-1 complex (yeast) or the B1 complex (mammals). |
| External URL | |
| Genes |