Component of the heterogeneous nuclear ribonucleoprotein (hnRNP) complexes which provide the substrate for the processing events that pre-mRNAs undergo before becoming functional, translatable mRNAs in the cytoplasm. Plays a role in the regulation of alternative splicing events. Binds G-rich sequences in pre-mRNAs and keeps target RNA in an unfolded state (By similarity). Identified in the spliceosome C complex. Interacts with AGO1, AGO2, TBP and TXNL4/DIM1 (By similarity). The N-terminal RRM domains are responsible for recognizing the G-tract of BCL-X RNA. Sumoylated. Truncated N-terminus. Truncated N-terminus. Extended C-terminus.