Recombinant Human EphA4 Fc Chimera Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Citations (3)
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Recombinant Human EphA4 Fc Chimera Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Measured by its binding ability in a functional ELISA.

When Recombinant Human EphA4 Fc Chimera is coated at 2 μg/mL (100 μL/well), the concentration of biotinylayed Recombinant Human Ephrin-A5 Fc Chimera (Catalog # 374-EA) that produces 50% of the optimal binding response is found to be approximately 5-25 ng/mL.

Mouse myeloma cell line, NS0-derived human EphA4 protein
Human EphA4
(Met1 - Thr547)
Accession # NP_004429.1
(Pro100 - Lys330)
N-terminus C-terminus
Accession #
N-terminal Sequence
Structure / Form
Disulfide-linked homodimer
Predicted Molecular Mass
85 kDa (monomer)
93-98 kDa, reducing conditions

Product Datasheets

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 100 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
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Reconstitution Calculator

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Background: EphA4

EphA4, also known as Hek8, Tyro1, and Sek, is a 120 ‑ 130 kDa glycosylated member of the Eph family of transmembrane receptor tyrosine kinases (1, 2). The A and B classes of Eph proteins are distinguished by Ephrin ligand binding preference but have a common structural organization. EphA4 is unusual in its ability to be activated by both Ephrin-A and -B molecules, although its interactions with Ephrin-B2 and -B3 are weaker than with Ephrin-A ligands (3, 4). Eph-Ephrin interactions are widely involved in the regulation of cell migration, tissue morphogenesis, and cancer progression. The 528 amino acid (aa) extracellular domain (ECD) of human EphA4 contains an N-terminal Ephrin binding region, a cysteine-rich region, and two fibronectin type III domains (FnIII). The 417 aa cytoplasmic domain contains the tyrosine kinase domain and a sterile alpha motif (SAM) (5). Within the ECD, human EphA4 shares 98% aa sequence identity with mouse and rat EphA4. EphA4 is activated by interactions with Ephrin ligands, triggering a repulsive effect on neurite outgrowth (6, 7). This function is important for the accurate guidance and pathfinding of axons in the spiral ganglion of the cochlea, the anterior commissure, and the corticospinal tract (6 ‑ 8). Neuronal EphA4 interactions with astrocyte‑expressed Ephrins also plays a critical role in long term potentiation by regulating hippocampal neuron dendrite arborization, spine maturation, and function (9 - 11). The up‑regulation of EphA4 in gastric carcinoma is negatively correlated with patient survival (12). In glioma, EphA4 associates with FGF R1, and this enhances FGF basic-induced tumor cell migration (13). EphA4 is also involved in morphogenesis of the thymic epithelium and T cell development (14).

  1. Pasquale, E.B. (2005) Nat. Rev. Mol. Cell Biol. 6:462.
  2. Merlos-Suarez, A. and E. Batlle (2008) Curr. Opin. Cell Biol. 20:194.
  3. Gale, N.W. et al. (1996) Neuron 17:9.
  4. Qin, H. et al. (2010) J. Biol. Chem. 285:644.
  5. Fox, G.M. et al. (1995) Oncogene 10:897.
  6. Brors, D. et al. (2003) J. Comp. Neurol. 462:90.
  7. Ho, S.K.Y. et al. (2009) Neuroscience 160:784.
  8. Canty, A.J. et al. (2006) Proc. Natl. Acad. Sci. 103:15629.
  9. Murai, K.K. et al. (2003) Nat. Neurosci. 6:153.
  10. Filosa, A. et al. (2009) Nat. Neurosci. 12:1285.
  11. Fu, A.K.Y. et al. (2011) Nat. Neurosci. 14:181.
  12. Oki, M. et al. (2008) World J. Gastroenterol. 14:5650.
  13. Fukai, J. et al. (2008) Mol. Cancer Ther. 7:2768.
  14. Munoz, J.J. et al. (2006) J. Immunol. 177:804.
Long Name
Eph Receptor A4
Entrez Gene IDs
2043 (Human); 13838 (Mouse)
Alternate Names
Cek8; EC 2.7.10; EC; EK8; EPH receptor A4; EphA4; EPH-like kinase 8; ephrin type-A receptor 4; Hek8; receptor protein-tyrosine kinase HEK8; SEK; Sek1; TYRO1 protein tyrosine kinase; Tyro1; Tyrosine-protein kinase receptor SEK; Tyrosine-protein kinase TYRO1

Citations for Recombinant Human EphA4 Fc Chimera Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

3 Citations: Showing 1 - 3
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  1. Ephrin receptor A10 monoclonal antibodies and the derived chimeric antigen receptor T cells exert an antitumor response in mouse models of triple-negative breast cancer
    Authors: JH Cha, LC Chan, YN Wang, YY Chu, CH Wang, HH Lee, W Xia, WC Shyu, SP Liu, J Yao, CW Chang, FR Cheng, J Liu, SO Lim, JL Hsu, WH Yang, GN Hortobagyi, C Lin, L Yang, D Yu, LB Jeng, MC Hung
    The Journal of Biological Chemistry, 2022;0(0):101817.
    Species: N/A
    Sample Types: Protein
    Applications: ELISA Capture
  2. Replicating infant-specific reactive astrocyte functions in the injured adult brain
    Authors: L Teo, AG Boghdadi, J Homman-Lud, IC Mundinano, WC Kwan, JA Bourne
    Progress in neurobiology, 2021;0(0):102108.
    Species: Human
    Sample Types: Recombinant Protein
    Applications: Bioassay
  3. Identification and characterization of Nanobodies targeting the EphA4 receptor
    Authors: L Schoonaert, L Rué, B Roucourt, M Timmers, S Little, L Chávez-Gut, M Dewilde, P Joyce, A Curnock, P Weber, J Haustraete, G Hassanzade, B De Stroope, L Van Den Bo, P Van Damme, R Lemmens, W Robberecht
    J. Biol. Chem., 2017;292(27):11452-11465.
    Species: Mouse
    Sample Types: Recombinant Protein
    Applications: Bioassay


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