Negative elongation factor

In molecular biology, the NELF (negative elongation factor) is a four-subunit protein complex (NELF-A, NELF-B, NELF-C/NELF-D, and NELF-E) that negatively impacts transcription by RNA polymerase II (Pol II) by pausing about 20-60 nucleotides downstream from the transcription start site (TSS).

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