Nuclear factor gene transcriptions

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Nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) is a protein complex that controls transcription of DNA, cytokine production and cell survival. NF-κB is found in almost all animal cell types and is involved in cellular responses to stimuli such as stress, cytokines, free radicals, heavy metals, ultraviolet irradiation, oxidized LDL, and bacterial or viral antigens.[1][2][3][4][5] NF-κB plays a key role in regulating the immune response to infection. Incorrect regulation of NF-κB has been linked to cancer, inflammatory and autoimmune diseases, septic shock, viral infection, and improper immune development. NF-κB has also been implicated in processes of synaptic plasticity and memory.[6][7][8][9][10][11]

Hepatic nuclear factors

Nuclear factor-B/Rel transcription factors

"The NF‐κB/Rel family of eukaryotic transcription factors controls many mammalian genes of significant biomedical importance, including genes encoding pro‐inflammatory cytokines, interferones, major histocompatibility complex (MHC) proteins, growth factors, cell adhesion molecules, but also viruses such as the human immunodeficiency virus (HIV) or Herpes (Baeuerle and Henkel, 1994; Thanos and Maniatis, 1995; Baeuerle and Baltimore, 1996; Baldwin, 1996; Chytil and Verdine, 1996)."[12]

Nuclear factor of activated T cells

DNA binding sites

The "natural 11 bp 𝜿B binding site MHC H-2 [is 3'-CCCCTAAGGGG-5'] which is well ordered in our structure."[12]

Hepatic nuclear factors (HNFs) bind through their DNA-binding domain (DBD) to consensus elements (A/G/T)(A/T)(A/G)T(C/T)(A/C/G)AT(A/C/G/T)(A/G/T), resulting in gene transcription.[13]

Leucine zippers

Leucine zippers are a dimerization motif of the BZIP domain (bZIP) (Basic-region leucine zipper) class of eukaryotic transcription factors.[14] The bZIP domain is 60 to 80 amino acids in length with a highly conserved DNA binding basic region and a more diversified leucine zipper dimerization region.[15] The localization of the leucines are critical for the DNA binding to the proteins. Leucine zippers are present in both eukaryotic and prokaryotic regulatory proteins, but are mainly a feature of eukaryotes.

They can also be annotated simply as ZIPs, and ZIP-like motifs have been found in proteins other than transcription factors and are thought to be one of the general protein modules for protein–protein interactions.[16]

The bZIP interacts with DNA via basic, amine residues (see basic amino acids in (provided table (sort by pH)) of certain amino acids in the "basic" domain, such as lysines and arginines. These basic residues interact in the major groove of the DNA, forming sequence-specific interactions. The mechanism of transcriptional regulation by bZIP proteins has been studied in detail. Most bZIP proteins show high binding affinity for the ACGT motifs, which include CACGTG (G box), GACGTC (C box), TACGTA (A box), AACGTT (T box), and a GCN4 motif, namely TGA(G/C)TCA.[17][15][18] The bZIP heterodimers exist in a variety of eukaryotes and are more common in organisms with higher evolution complexity.[19] Heterodimeric bZIP proteins differ from homodimeric bZIP and from each other in protein-protein interaction affinity.[20] These heterodimers exhibit complex DNA binding specificity. When combined with a different partner, most of the bZIP pairs bind to DNA sequences that each individual partner prefers. In some cases, dimerization of different bZIP partners can change the DNA sequence that the pair targets in a manner that could not have been predicted based on the preferences of each partner alone. This suggests that, as heterodimers, bZIP transcription factors are able to change their preferences for which location they target in the DNA. The ability of bZIP domain forming dimers with different partners greatly expands the locations on the genome to which bZIP transcription factors can bind and from which they can regulate gene expression.[20]

A small number of bZIP factors such as OsOBF1 can also recognize palindromic sequences.[21] However, the others, including LIP19, OsZIP-2a, and OsZIP-2b, do not bind to DNA sequences. Instead, these bZIP proteins form heterodimers with other bZIPs to regulate transcriptional activities.[21][22]

Nuclear factor genes

Gene ID: 4779 is NFE2L1 nuclear factor, erythroid 2 like 1 aka transcription factor 11 (basic leucine zipper type) on 17q21.32: "This gene encodes a protein that is involved in globin gene expression in erythrocytes. Confusion has occurred in bibliographic databases due to the shared symbol of NRF1 for this gene, NFE2L1, and for "nuclear respiratory factor 1" which has an official symbol of NRF1."[23]

  1. NP_001317190.1 endoplasmic reticulum membrane sensor NFE2L1 isoform 2 [variant 2].[23]
  2. NP_001317191.1 endoplasmic reticulum membrane sensor NFE2L1 isoform 3 [variant 3].[23]
  3. NP_003195.1 endoplasmic reticulum membrane sensor NFE2L1 isoform 1 [variant 1].[23]

Gene ID: 4780 is NFE2L2 nuclear factor, erythroid 2 like 2 on 2q31.2: "This gene encodes a transcription factor which is a member of a small family of basic leucine zipper (bZIP) proteins. The encoded transcription factor regulates genes which contain antioxidant response elements (ARE) in their promoters; many of these genes encode proteins involved in response to injury and inflammation which includes the production of free radicals. Multiple transcript variants encoding different isoforms have been characterized for this gene."[24]

  1. NP_001138884.1 nuclear factor erythroid 2-related factor 2 isoform 2: "Transcript Variant: This variant (2) represents use of an alternate promoter and 5' UTR and uses a downstream start codon, compared to variant 1. The resulting isoform (2) has a shorter N-terminus, compared to isoform 1. Variants 2, 4 and 5 encode the same protein."[24]
  2. NP_001138885.1 nuclear factor erythroid 2-related factor 2 isoform 3: "Transcript Variant: This variant (3) represents use of an alternate promoter and 5' UTR, uses a downstream start codon, and uses an alternate in-frame splice site in the 3' coding region, compared to variant 1. The resulting isoform (3) has a shorter N-terminus and is missing an internal segment, compared to isoform 1."[24]
  3. NP_001300829.1 nuclear factor erythroid 2-related factor 2 isoform 2: "Transcript Variant: This variant (4) represents use of an alternate promoter and 5' UTR and uses a downstream start codon, compared to variant 1. The resulting isoform (2) has a shorter N-terminus, compared to isoform 1. Variants 2, 4 and 5 encode the same protein."[24]
  4. NP_001300830.1 nuclear factor erythroid 2-related factor 2 isoform 2: "Transcript Variant: This variant (5) represents use of an alternate promoter and 5' UTR and uses a downstream start codon, compared to variant 1. The resulting isoform (2) has a shorter N-terminus, compared to isoform 1. Variants 2, 4 and 5 encode the same protein."[24]
  5. NP_001300831.1 nuclear factor erythroid 2-related factor 2 isoform 4: "Transcript Variant: This variant (6) lacks an alternate in-frame exon in the 3' coding region compared to variant 1. The resulting isoform (4) is shorter compared to isoform 1."[24]
  6. NP_001300832.1 nuclear factor erythroid 2-related factor 2 isoform 5: "Transcript Variant: This variant (7) uses an alternate in-frame splice site in the 3' coding region compared to variant 1. The resulting isoform (5) is shorter compared to isoform 1."[24]
  7. NP_001300833.1 nuclear factor erythroid 2-related factor 2 isoform 6: "Transcript Variant: This variant (8) represents use of an alternate promoter and 5' UTR and uses an alternate in-frame splice site in the 3' coding region, compared to variant 1. The resulting isoform (6) is shorter compared to isoform 1."[24]
  8. NP_006155.2 nuclear factor erythroid 2-related factor 2 isoform 1: "Transcript Variant: This variant (1) represents the longest transcript and encodes the longest isoform (1)."[24]

Gene ID: 4781 is NFIB nuclear factor I B aka CCAAT-box-binding transcription factor or TGGCA-binding protein on 9p23-p22.3.[25]

  1. NP_001177666.1 nuclear factor 1 B-type isoform 1: "Transcript Variant: This variant (1) encodes isoform 1."[25]
  2. NP_001177667.1 nuclear factor 1 B-type isoform 2: "Transcript Variant: This variant (2) has multiple differences, one of which results in translation from an upstream start codon, compared to variant 1. The resulting protein (isoform 2) has a different and longer N-terminus and a shorter C-terminus when it is compared to isoform 1."[25]
  3. NP_001269716.1 nuclear factor 1 B-type isoform 4: "Transcript Variant: This variant (4) contains a distinct 5' UTR, lacks an in-frame portion of the 5' coding region and contains an alternate in-frame exon in the 3' coding region, compared to variant 1. The resulting isoform (4) is shorter compared to isoform 1."[25]
  4. NP_001356387.1 nuclear factor 1 B-type isoform 5: "Transcript Variant: This variant (5) encodes the longest isoform (5)."[25]
  5. NP_001356388.1 nuclear factor 1 B-type isoform 6 [variant 6].[25]
  6. NP_001356389.1 nuclear factor 1 B-type isoform 7 [variant 7].[25]
  7. NP_001356390.1 nuclear factor 1 B-type isoform 8 [variant 8].[25]
  8. NP_001356391.1 nuclear factor 1 B-type isoform 9 [variant 9].[25]
  9. NP_001356392.1 nuclear factor 1 B-type isoform 10 [variant 10].[25]
  10. NP_001356393.1 nuclear factor 1 B-type isoform 11 [variant 11].[25]
  11. NP_001356394.1 nuclear factor 1 B-type isoform 12 [variant 12].[25]
  12. NP_001356395.1 nuclear factor 1 B-type isoform 13 [variant 13].[25]
  13. NP_001356396.1 nuclear factor 1 B-type isoform 14 [variant 14].[25]
  14. NP_001356397.1 nuclear factor 1 B-type isoform 15 [variant 15].[25]
  15. NP_001356398.1 nuclear factor 1 B-type isoform 16 [variant 16].[25]
  16. NP_001356399.1 nuclear factor 1 B-type isoform 17 [variant 17].[25]
  17. NP_001356400.1 nuclear factor 1 B-type isoform 18 [variant 18].[25]
  18. NP_001356401.1 nuclear factor 1 B-type isoform 19 [variant 19].[25]
  19. NP_001356402.1 nuclear factor 1 B-type isoform 20 [variant 20].[25]
  20. NP_001356403.1 nuclear factor 1 B-type isoform 21 [variant 21].[25]
  21. NP_001356404.1 nuclear factor 1 B-type isoform 22 [variant 22].[25]
  22. NP_001356405.1 nuclear factor 1 B-type isoform 23 [variant 23].[25]
  23. NP_001356406.1 nuclear factor 1 B-type isoform 24 [variant 24].[25]
  24. NP_001356407.1 nuclear factor 1 B-type isoform 25 [variant 25].[25]
  25. NP_001356408.1 nuclear factor 1 B-type isoform 26 [variant 26].[25]
  26. NP_001356409.1 nuclear factor 1 B-type isoform 27 [variant 27].[25]
  27. NP_001356410.1 nuclear factor 1 B-type isoform 28 [variant 28].[25]
  28. NP_005587.2 nuclear factor 1 B-type isoform 3: "Transcript Variant: This variant (3) lacks alternate exons in the 3' end, compared to variant 1. The resulting protein (isoform 3) is shorter when it is compared to isoform 1."[25]

Gene ID: 4783 is NFIL3 nuclear factor, interleukin 3 regulated on 9q22.31: "The protein encoded by this gene is a transcriptional regulator that binds as a homodimer to activating transcription factor (ATF) sites in many cellular and viral promoters. The encoded protein represses PER1 and PER2 expression and therefore plays a role in the regulation of circadian rhythm. Three transcript variants encoding the same protein have been found for this gene."[26]

  1. NP_001276928.1 nuclear factor interleukin-3-regulated protein: "Transcript Variant: This variant (1) represents the longest transcript. All three variants encode the same protein."[26] "NFIL3, also called E4 promoter-binding protein 4 (E4BP4), is a Basic leucine zipper (bZIP) transcription factor that was independently identified as a transactivator of the IL3 promoter in T-cells and as a transcriptional repressor that binds to a DNA sequence site in the adenovirus E4 promoter. Its expression levels are regulated by cytokines and it plays crucial functions in the immune system. It is required for the development of natural killer cells and CD8+ conventional dendritic cells. In B-cells, NFIL3 mediates immunoglobulin heavy chain class switching that is required for IgE production, thereby influencing allergic and pathogenic immune responses. It is also involved in the polarization of T helper responses. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription."[27]
  2. NP_001276929.1 nuclear factor interleukin-3-regulated protein: "Transcript Variant: This variant (2) differs in the 5' UTR compared to variant 1. All three variants encode the same protein."[26]
  3. NP_005375.2 nuclear factor interleukin-3-regulated protein: "Transcript Variant: This variant (3) differs in the 5' UTR compared to variant 1. All three variants encode the same protein."[26]

Gene ID: 4784 is NFIX nuclear factor I X aka CCAAT-box-binding transcription factor, TGGCA-binding protein, on 19p13.13: "The protein encoded by this gene is a transcription factor that binds the palindromic sequence 5'-TTGGCNNNNNGCCAA-3 in viral and cellular promoters. The encoded protein can also stimulate adenovirus replication in vitro. Three transcript variants encoding different isoforms have been found for this gene."[28]

  1. NP_001257972.1 nuclear factor 1 X-type isoform 1: "Transcript Variant: This variant (1) encodes the longest isoform (1)."[28]
  2. NP_001257973.1 nuclear factor 1 X-type isoform 3: "Transcript Variant: This variant (3) differs in the 5' UTR and coding sequence and lacks an alternate 3' exon compared to variant 1, that causes a frameshift. The resulting isoform (3) has shorter and distinct N- and C-termini compared to isoform 1."[28]
  3. NP_001352831.1 nuclear factor 1 X-type isoform 4 [variant 4].[28]
  4. NP_001352911.1 nuclear factor 1 X-type isoform 5 [variant 5].[28]
  5. NP_001352912.1 nuclear factor 1 X-type isoform 6 [variant 6].[28]
  6. NP_001352913.1 nuclear factor 1 X-type isoform 7 [variant 7].[28]
  7. NP_001352914.1 nuclear factor 1 X-type isoform 8 [variant 8].[28]
  8. NP_001365333.1 nuclear factor 1 X-type isoform 9 [variant 9].[28]
  9. NP_001365334.1 nuclear factor 1 X-type isoform 10 [variant 10].[28]
  10. NP_002492.2 nuclear factor 1 X-type isoform 2: "Transcript Variant: This variant (2) differs in the 5' UTR and coding sequence and lacks an alternate 3' exon compared to variant 1, that causes a frameshift. The resulting isoform (2) has shorter and distinct N- and C-termini compared to isoform 1."[28]

Gene ID: 4790 is NFKB1 nuclear factor kappa B subunit 1 on 4q24: "This gene encodes a 105 kD protein which can undergo cotranslational processing by the 26S proteasome to produce a 50 kD protein. The 105 kD protein is a Rel protein-specific transcription inhibitor and the 50 kD protein is a DNA binding subunit of the NF-kappa-B (NFKB) protein complex. NFKB is a transcription regulator that is activated by various intra- and extra-cellular stimuli such as cytokines, oxidant-free radicals, ultraviolet irradiation, and bacterial or viral products. Activated NFKB translocates into the nucleus and stimulates the expression of genes involved in a wide variety of biological functions. Inappropriate activation of NFKB has been associated with a number of inflammatory diseases while persistent inhibition of NFKB leads to inappropriate immune cell development or delayed cell growth. Alternative splicing results in multiple transcript variants encoding different isoforms, at least one of which is proteolytically processed."[29]

  1. NP_001158884.1 nuclear factor NF-kappa-B p105 subunit isoform 2 proprotein: "Transcript Variant: This variant (2) uses an alternate in-frame splice site in the 5' coding region compared to variant 1. The resulting isoform (2) has the same N- and C-termini but is 1 amino acid shorter than isoform 1. Variants 2 and 3 encode the same isoform (2)."[29]
  2. NP_001306155.1 nuclear factor NF-kappa-B p105 subunit isoform 2 proprotein: "Transcript Variant: This variant (3) differs in its 5' UTR and uses an alternate in-frame splice site in the 5' coding region compared to variant 1. The resulting isoform (2) has the same N- and C-termini but is 1 amino acid shorter than isoform 1. Variants 2 and 3 encode the same isoform (2)."[29]
  3. NP_003989.2 nuclear factor NF-kappa-B p105 subunit isoform 1: "Transcript Variant: This variant (1) represents the longest transcript and encodes the longer isoform (1). This isoform (1) may undergo proteolytic processing similar to that of isoform 2."[29]

Gene ID: 4791 is NFKB2 nuclear factor kappa B subunit 2 on 10q24.32: "This gene encodes a subunit of the transcription factor complex nuclear factor-kappa-B (NFkB). The NFkB complex is expressed in numerous cell types and functions as a central activator of genes involved in inflammation and immune function. The protein encoded by this gene can function as both a transcriptional activator or repressor depending on its dimerization partner. The p100 full-length protein is co-translationally processed into a p52 active form. Chromosomal rearrangements and translocations of this locus have been observed in B cell lymphomas, some of which may result in the formation of fusion proteins. There is a pseudogene for this gene on chromosome 18. Alternative splicing results in multiple transcript variants."[30]

  1. NP_001070962.1 nuclear factor NF-kappa-B p100 subunit isoform a: "Transcript Variant: This variant (1) encodes the longest isoform (a). Variants 1 and 5 both encode the same isoform (a)."[30]
  2. NP_001248332.1 nuclear factor NF-kappa-B p100 subunit isoform b: "Transcript Variant: This variant (4) differs in the 5' UTR and uses an alternate in-frame splice site in the 3' coding region, compared to variant 1. The encoded isoform (b) is shorter than isoform a. Variants 2, 3, and 4 encode the same isoform (b)."[30]
  3. NP_001275653.1 nuclear factor NF-kappa-B p100 subunit isoform b: "Transcript Variant: This variant (3) differs in the 5' UTR and uses an alternate in-frame splice site in the 3' coding region, compared to variant 1. The encoded isoform (b) is shorter than isoform a. Variants 2, 3, and 4 encode the same isoform (b)."[30]
  4. NP_001309863.1 nuclear factor NF-kappa-B p100 subunit isoform a: "Transcript Variant: This variant (5) and variant 1 both encode the same isoform (a)."[30]
  5. NP_001309864.1 nuclear factor NF-kappa-B p100 subunit isoform c [variant 6].[30]
  6. NP_002493.3 nuclear factor NF-kappa-B p100 subunit isoform b: "Transcript Variant: This variant (2) differs in the 5' UTR and uses an alternate in-frame splice site in the 3' coding region, compared to variant 1. The encoded isoform (b) is shorter than isoform a. Variants 2, 3, and 4 encode the same isoform (b)."[30]

Gene ID: 4792 is NFKBIA NFKB inhibitor alpha aka major histocompatibility complex enhancer-binding protein [mitotic arrest deficient 3] MAD3 on 14q13.2: "This gene encodes a member of the NF-kappa-B inhibitor family, which contain multiple ankrin repeat domains. The encoded protein interacts with REL dimers to inhibit NF-kappa-B/REL complexes which are involved in inflammatory responses. The encoded protein moves between the cytoplasm and the nucleus via a nuclear localization signal and CRM1-mediated nuclear export. Mutations in this gene have been found in ectodermal dysplasia anhidrotic with T-cell immunodeficiency autosomal dominant disease."[31]

Gene ID: 5970 is RELA RELA proto-oncogene, NF-kB subunit, aka NFKB3 on 11q13.1: "NF-kappa-B is a ubiquitous transcription factor involved in several biological processes. It is held in the cytoplasm in an inactive state by specific inhibitors. Upon degradation of the inhibitor, NF-kappa-B moves to the nucleus and activates transcription of specific genes. NF-kappa-B is composed of NFKB1 or NFKB2 bound to either REL, RELA, or RELB. The most abundant form of NF-kappa-B is NFKB1 complexed with the product of this gene, RELA. Four transcript variants encoding different isoforms have been found for this gene."[32]

  1. NP_001138610.1 transcription factor p65 isoform 2: "Transcript Variant: This variant (2) uses an alternate in-frame acceptor splice site at one of the coding exons compared to transcript variant 1. This results in a shorter isoform (2) missing a 3 aa segment compared to isoform 1."[32]
  2. NP_001230913.1 transcription factor p65 isoform 3: "Transcript Variant: This variant (3) uses an alternate in-frame splice site at the 5' end of the last exon compared to variant 1. The resulting isoform (3) lacks an alternate internal segment compared to isoform 1."[32]
  3. NP_001230914.1 transcription factor p65 isoform 4: "Transcript Variant: This variant (4) lacks an alternate internal in-frame segment in the last exon compared to variant 1. The resulting isoform (4) lacks an alternate internal segment compared to isoform 1."[32]
  4. NP_068810.3 transcription factor p65 isoform 1: "Transcript Variant: This variant (1) represents the predominant transcript and encodes the longer isoform (1)."[32]

See also

References

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  23. 23.0 23.1 23.2 23.3 RefSeq (July 2008). "NFE2L1 nuclear factor, erythroid 2 like 1 [ Homo sapiens (human) ]". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 4 May 2020.
  24. 24.0 24.1 24.2 24.3 24.4 24.5 24.6 24.7 24.8 RefSeq (September 2015). "NFE2L2 nuclear factor, erythroid 2 like 2 [ Homo sapiens (human) ]". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 4 May 2020.
  25. 25.00 25.01 25.02 25.03 25.04 25.05 25.06 25.07 25.08 25.09 25.10 25.11 25.12 25.13 25.14 25.15 25.16 25.17 25.18 25.19 25.20 25.21 25.22 25.23 25.24 25.25 25.26 25.27 25.28 HGNC (5 April 2020). "NFIB nuclear factor I B [ Homo sapiens (human) ]". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 4 May 2020.
  26. 26.0 26.1 26.2 26.3 RefSeq (February 2014). "NFIL3 nuclear factor, interleukin 3 regulated [ Homo sapiens (human) ]". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 3 May 2020.
  27. cd14694 (2 March 2014). "Conserved Protein Domain Family bZIP_NFIL3". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 3 May 2020.
  28. 28.00 28.01 28.02 28.03 28.04 28.05 28.06 28.07 28.08 28.09 28.10 RefSeq (August 2012). "NFIX nuclear factor I X [ Homo sapiens (human) ]". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 3 May 2020.
  29. 29.0 29.1 29.2 29.3 RefSeq (February 2016). "NFKB1 nuclear factor kappa B subunit 1 [ Homo sapiens (human) ]". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 3 May 2020.
  30. 30.0 30.1 30.2 30.3 30.4 30.5 30.6 RefSeq (December 2013). "NFKB2 nuclear factor kappa B subunit 2 [ Homo sapiens (human) ]". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 3 May 2020.
  31. RefSeq (August 2011). "NFKBIA NFKB inhibitor alpha [ Homo sapiens (human) ]". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 28 March 2020.
  32. 32.0 32.1 32.2 32.3 32.4 RefSeq (September 2011). "RELA RELA proto-oncogene, NF-kB subunit [ Homo sapiens (human) ]". 8600 Rockville Pike, Bethesda MD, 20894 USA: National Center for Biotechnology Information, U.S. National Library of Medicine. Retrieved 3 May 2020.

External links

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