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Official Full Name: negative elongation factor complex member B<br />Also known as: COBRA1; NELF-B<br />NELFB is a subunit of negative elongation factor (NELF), which also includes NELFA, either NELFC or NELFD, and NELFE. NELF acts with DRB sensitivity-inducing factor (DSIF), a heterodimer of SPT4 and SPT5, to cause transcriptional pausing of RNA polymerase II.