NTRK3(496-641), the NTRK3 (TRKC) killer fragment (KF) binds to NELFB in the cytosol. NELFB (COBRA1) is known as a negative regulator of transcriptional elongation and a BRCA1 co-factor. NELFB is predominantly nuclear but is also found outside of the nucleus (Ichim et al. 2013).
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