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SPOC (Spen paralog and ortholog C-terminal) domain found in PHD finger protein 3 (PHF3) PHF3 is a human homolog of yeast protein bypass of Ess1 (Bye1), a nuclear protein with a domain resembling the central domain in the transcription elongation factor TFIIS. It is ubiquitously expressed in normal tissues including brain, but its expression is significantly reduced or lost in glioblastomas. PHF3 contains an N-terminal plant homeodomain (PHD) finger, a central RNA polymerase II (Pol II)-binding TFIIS-like domain (TLD) domain, and a C-terminal SPOC domain. This model corresponds to the SPOC domain which is involved in developmental signaling and has also been proposed to be a phosphorylation binding module.
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