FUNCTION: Participates in the second step of pre-mRNA splicing. {ECO:0000269|PubMed:9000057}....
                        FUNCTION: Participates in the second step of pre-mRNA splicing. {ECO:0000269|PubMed:9000057}.
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                        GO - Biological processes (BP): 
                        generation of catalytic spliceosome for second transesterification step [GO:0000350]; mRNA processing [GO:0006397]; nuclear mRNA surveillance [GO:0071028]; RNA splicing [GO:0008380]...
                        generation of catalytic spliceosome for second transesterification step [GO:0000350]; mRNA processing [GO:0006397]; nuclear mRNA surveillance [GO:0071028]; RNA splicing [GO:0008380]
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                        GO - Molecular function (MF): 
                        ...
                        
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                        GO - Cellular component (CC): 
                        nuclear speck [GO:0016607]; nucleus [GO:0005634]; spliceosomal complex [GO:0005681]; U2-type post-spliceosomal complex [GO:0071021]; U4/U6 x U5 tri-snRNP complex [GO:0046540]; U5 snRNP [GO:0005682]...
                        nuclear speck [GO:0016607]; nucleus [GO:0005634]; spliceosomal complex [GO:0005681]; U2-type post-spliceosomal complex [GO:0071021]; U4/U6 x U5 tri-snRNP complex [GO:0046540]; U5 snRNP [GO:0005682]
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