Human FCRL2/FcRH2, FCRL5/FcRH5 Alexa Fluor® 350-conjugated Antibody

Clone 296902 was used by HLDA to establish CD designation
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Human FCRL2/FcRH2, FCRL5/FcRH5 Alexa Fluor® 350-conjugated Antibody Summary

Species Reactivity
Detects human FCRL2/FcRH2 and FCRL5/FcRH5 in Western blots.  In Western blots, approximately 25% cross-reactivity with recombinant human FCRL1, FCRL3, and FCRL4 is observed.
Monoclonal Mouse IgG1 Clone # 296902
Protein A or G purified from hybridoma culture supernatant
Mouse myeloma cell line NS0-derived recombinant human FCRL2/FcRH2
Accession # Q96LA5
Supplied 0.2 mg/mL in a saline solution containing BSA and Sodium Azide.
Alexa Fluor 350 (Excitation= 346 nm, Emission= 442 nm)


Recommended Concentration
Flow Cytometry
0.25-1 µg/106 cells
Human peripheral blood monocytes

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

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Preparation and Storage

The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage
Protect from light. Do not freeze.
  • 12 months from date of receipt, 2 to 8 °C as supplied.

Background: FCRL2/FcRH2

Fc receptor-like 2 (FCRL2), also known as FcRH2 and IRTA4, belongs to the family of glycoprotein homologs of classical immunoglobulin (Ig) Fc receptors. In human, the type I transmembrane FCRL protein family contains from three to nine immunoglobulin-like domains (1, 2). Mature human FcRH2 consists of a 382 amino acid (aa) extracellular domain (ECD) with four Ig-like C2-set domains, a 21 aa transmembrane segment, and an 86 aa cytoplasmic domain with one ITAM-like, and two ITIM-like motifs (3‑5). Alternate splicing of human FCRL2 may generate isoforms with N-terminal, internal, or C-terminal deletions (4, 5). The gene for FcRH2 maps to the human Iq21-23 locus which is a hotspot for chromosomal translocation events associated with B cell malignancies (3, 6). Although there are several Fc receptor-like genes in the mouse, none of these is a clear ortholog to human FCRL2 (7). FCRL proteins are differentially expressed among B cells (2). FCRL2 is preferentially expressed on naïve and CD27+ memory B cells within the spleen, lymph nodes, tonsils, and peripheral blood (3, 4, 8, 9). It is also expressed on most B cells in B cell chronic lymphocytic leukemia (B-CLL) patients (10). FCRL2 upregulation is associated with mutation of the immunoglobulin heavy chain variable (IGHV) and less aggressive forms of B-CLL (9, 11).


  1. Maltais, L.J. et al. (2006) Nat. Immunol. 7:431.
  2. Davis, R.S. et al. (2007) Annu. Rev. Immunol. 25:525.
  3. Miller, I. et al. (2002) Blood 99:2662.
  4. Davis, R.S. et al. (2001) Proc. Natl. Acad. Sci. 98:9772.
  5. Xu, M.J. et al. (2001) Biochem. Biophys. Res. Commun. 280:768.
  6. Hatzivassiliou, G. et al. (2001) Immunity 14:277.
  7. Davis, R.S. et al. (2004) Int. Immunol. 16:1343.
  8. Polson, A.G. et al. (2006) Int. Immunol. 18:1363.
  9. Huttmann, A. et al. (2006) Leukemia 20:1774.
  10. Kazemi, T. et al. (2008) Int. J. Cancer 123:2113.
  11. Li, F.J. et al. (2008) Blood 112:179.
Long Name
Fc Receptor-like 2
Entrez Gene IDs
79368 (Human)
Alternate Names
CD307b antigen; CD307b; Fc receptor homolog 2; Fc receptor-like 2; FcRH2; FCRH2SPAP1B; FCRL2; FcR-like protein 2; IFGP family protein 4; IFGP4; Immunoglobulin receptor translocation-associated protein 4; immunoglobulin superfamily Fc receptor, gp42; IRTA4; IRTA4SPAP1C; SH2 domain containing phosphatase anchor protein 1; SH2 domain-containing phosphatase anchor protein 1Fc receptor-like protein 2; SPAP1; SPAP1A; SPAP1immune receptor translocation-associated protein 4

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Product Specific Notices

This product is provided under an agreement between Life Technologies Corporation and R&D Systems, Inc, and the manufacture, use, sale or import of this product is subject to one or more US patents and corresponding non-US equivalents, owned by Life Technologies Corporation and its affiliates. The purchase of this product conveys to the buyer the non-transferable right to use the purchased amount of the product and components of the product only in research conducted by the buyer (whether the buyer is an academic or for-profit entity). The sale of this product is expressly conditioned on the buyer not using the product or its components (1) in manufacturing; (2) to provide a service, information, or data to an unaffiliated third party for payment; (3) for therapeutic, diagnostic or prophylactic purposes; (4) to resell, sell, or otherwise transfer this product or its components to any third party, or for any other commercial purpose. Life Technologies Corporation will not assert a claim against the buyer of the infringement of the above patents based on the manufacture, use or sale of a commercial product developed in research by the buyer in which this product or its components was employed, provided that neither this product nor any of its components was used in the manufacture of such product. For information on purchasing a license to this product for purposes other than research, contact Life Technologies Corporation, Cell Analysis Business Unit, Business Development, 29851 Willow Creek Road, Eugene, OR 97402, Tel: (541) 465-8300. Fax: (541) 335-0354.


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