Human/Mouse/Rat Relaxin R1 Alexa Fluor® 405-conjugated Antibody

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Human/Mouse/Rat Relaxin R1 Alexa Fluor® 405-conjugated Antibody Summary

Species Reactivity
Human, Mouse, Rat
Detects human Relaxin R1 in direct ELISAs and detects human, mouse, and rat Relaxin R1 in Western blots.
Monoclonal Mouse IgG1 Clone # 933344
Chinese hamster ovary cell line CHO-derived recombinant human Relaxin R1
Accession # Q9HBX9
Supplied 0.2 mg/mL in a saline solution containing BSA and Sodium Azide.
Alexa Fluor 405 (Excitation= 405 nm, Emission= 421 nm)


Recommended Concentration
Flow Cytometry
0.25-1 µg/106 cells
SH‑SY5Y human neuroblastoma cell line

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
Store the unopened product at 2 - 8 °C. Do not use past expiration date.

Background: Relaxin R1

Relaxin R1 (Relaxin Receptor 1), also known as RXFP1 (Relaxin Family Peptide Receptor 1) or LGR7 (Leucine‑rich G‑protein‑coupled Receptor 7) is a member of family C of the LGRs, and is one of four receptors for Relaxin family proteins. Relaxin R1 shows highest affinity for human Relaxins 1, 2 and 3, while RXFP2 binds Relaxin 2 and the related INSL3, and RXFP3 primarily binds Relaxin 3 (1, 2). The 757 amino acid (aa) human Relaxin R1 contains an N‑terminal 409 aa extracellular domain (ECD) with a calcium‑binding LDL R class A (LDLa) domain and 10 leucine‑rich repeats (LRR) with several N‑glycosylation sites. The C‑terminus contains 12 transmembrane domains within aa 410‑672. Human Relaxin R1 (aa 1‑398) shares 84, 86, 85, 85 and 91% aa sequence identity with mouse, rat, equine, bovine and porcine Relaxin R1, respectively. Isoforms of 724 and 709 aa lack aa 63‑96 and 300‑348, respectively, while isoforms of 176, 189, 191 and 337 aa diverge after aa 154, 179, 181 and 324, respectively (3, 4). These forms may dimerize with full‑length Relaxin R1 and reduce its expression on the cell surface (3, 4). Receptor activation and cAMP signaling depend on the LDLa domain, and Relaxin binding requires the LRR repeats, with a secondary binding site within transmembrane region exoloops (1, 2, 5). Of LGR family members, RXFP1 and RXFP2 are unique in that they are not internalized to down‑regulate signaling, and their LDLa domains allow transmission of both G‑protein‑dependent and ‑independent signals (1, 2, 6, 7). Engagement of Relaxin R1 by Relaxin (mainly Relaxin 2 in humans) supports female reproduction by promoting uterine angiogenesis, ovarian follicle ripening, and endometrial, cervical and nipple development (8‑10). In male reproduction, Relaxin R1 acts in the prostate to enhance sperm motility (11). It reduces fibrosis in the heart, skin, lungs, liver, kidney, and reproductive tissues by combating aberrant collagen buildup (12). In the vasculature, it mediates vasodilation and decreases blood pressure. Relaxin R1 is expressed on human leukocytes and promotes adhesion, migration, and osteoclast differentiation (13, 14). Additional effects on heart, lungs, kidney and brain are reported, some of which may be species‑specific (1).

  1. van der Westhuizen, E.T. et al. (2008) Drug Discov. Today 13:640.
  2. Kong, R.C.K. et al. (2010) Mol. Cell. Endocrinol. 320:1.
  3. Muda, M. et al. (2005) Mol. Hum. Reprod. 11:591.
  4. Kern, A. et al. (2008) Endocrinology 149:1227.
  5. Hopkins, E.J. et al. (2007) J. Biol. Chem. 282:4172.
  6. Kern, A. and G.D. Bryant-Greenwood (2009) Endocrinology 150:2419.
  7. Halls, M.L. (2012) Br. J. Pharmacol. 165:1644.
  8. Kamat, A.A. et al. (2004) Endocrinology 145:4712.
  9. Krajnc-Franken, M.A. et al. (2004) Mol. Cell. Biol. 24:687.
  10. Yao, L. et al. (2008) Endocrinology 149:2072.
  11. Ferlin, A. et al. (2012) J. Androl. 33:474.
  12. Hossain, M.A. (2011) Biochemistry 50:1368.
  13. Ferlin, A. et al. (2010) Bone 46:504.
  14. Figueiredo, K.A. et al. (2006) J. Biol. Chem. 281:3030.
Long Name
Relaxin Receptor 1
Entrez Gene IDs
59350 (Human); 381489 (Mouse); 295144 (Rat)
Alternate Names
leucine-rich repeat-containing G protein-coupled receptor 7; Leucine-rich repeat-containing G-protein coupled receptor 7; LGR7; LGR7.1; LGR7.10; LGR7LGR7.2; MGC138347; MGC142177; Relaxin family peptide receptor 1; Relaxin R1; relaxin receptor 1; relaxin/insulin-like family peptide receptor 1; RelaxinR1; RXFP1; RXFPR1

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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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