The function of Ensembl gene identifier ENSG00000175215 (CTDSP2, CTD small phosphatase 2) is as follows. Preferentially catalyzes the dephosphorylation of 'Ser-5' within the tandem 7 residue repeats in the C-terminal domain (CTD) of the largest RNA polymerase II subunit POLR2A. Negatively regulates RNA polymerase II transcription, possibly by controlling the transition from initiation/capping to processive transcript elongation. Recruited by REST to neuronal genes that contain RE-1 elements, leading to neuronal gene silencing in non-neuronal cells. May contribute to the development of sarcomas. {ECO:0000269|PubMed:12721286, ECO:0000269|PubMed:15681389}.