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PE Rat Anti-Mouse CD121a
Product Details
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BD Pharmingen™
Il1r1; IL-1 Receptor Type I/p80; IL-1 R alpha; IL-1 Rα; IL-1 RI
Mouse (QC Testing)
Rat IgG1, κ
IL-1 receptors from the C57BL/6 mouse T lymphoma EL4.IL2
Flow cytometry (Routinely Tested)
0.2 mg/ml
Aqueous buffered solution containing ≤0.09% sodium azide.

Preparation And Storage

The monoclonal antibody was purified from tissue culture supernatant or ascites by affinity chromatography. The antibody was conjugated with R-PE under optimum conditions, and unconjugated antibody and free PE were removed. Store undiluted at 4°C and protected from prolonged exposure to light. Do not freeze.

Product Notices

  1. Since applications vary, each investigator should titrate the reagent to obtain optimal results.
  2. Please refer to for technical protocols.
  3. For fluorochrome spectra and suitable instrument settings, please refer to our Multicolor Flow Cytometry web page at
  4. Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.
557489 Rev. 10
Antibody Details
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The 35F5 monoclonal antibody specifically binds to the Type I Interleukin-1 Receptor (IL-1 RI) which is also known as CD121a. CD121a is expressed by T-cell, fibroblast, and epithelial cell lines such as EL-4 and 3T3. Expression of the 35F5 epitope on normal mouse thymocytes and splenocytes is undetectable by flow cytometry. CD121a is an 80 kDa type-I transmembrane glycoprotein, a member of the Ig superfamily that mediates the inflammatory responses of leucocytes to IL-1. The 35F5 antibody is capable of blocking the binding of IL-1α, IL-1β, and IL-1 receptor antagonist to the Type I IL-1 Receptor. The 35F5 mAb is highly specific for the Type I IL-1 Receptor and does not react with the Type II IL-1 Receptor (CD121b) which is present on mouse macrophage and B-cell lines and polymorphonuclear leukocytes (PMN) and PMN progenitors.

557489 Rev. 10
Format Details
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R-Phycoerythrin (PE), is part of the BD family of Phycobiliprotein dyes. This fluorochrome is a multimeric fluorescent phycobiliprotein with excitation maximum (Ex Max) of 496 nm and 566 nm and an emission maximum (Em Max) at 576 nm. PE is designed to be excited by the Blue (488 nm), Green (532 nm) and Yellow-Green (561 nm) lasers and detected using an optical filter centered near 575 nm (e.g., a 575/26-nm bandpass filter). As PE is excited by multiple lasers, this can result in cross-laser excitation and fluorescence spillover on instruments with various combinations of Blue, Green, and Yellow-Green lasers. Please ensure that your instrument’s configurations (lasers and optical filters) are appropriate for this dye.
Yellow-Green 488 nm, 532 nm, 561 nm
496 nm, 566 nm
576 nm
557489 Rev.10
Citations & References
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Development References (3)

  1. Callard R, Gearing A. Callard R, Gearing A. The Cytokine Facts Book. San Diego: Academic Press; 1994.
  2. Chizzonite R, Truitt T, Kilian PL, et al. Two high-affinity interleukin 1 receptors represent separate gene products. Proc Natl Acad Sci U S A. 1989; 86(20):8029-8033. (Immunogen). View Reference
  3. McIntyre KW, Stepan GJ, Kolinsky KD, et al. Inhibition of interleukin 1 (IL-1) binding and bioactivity in vitro and modulation of acute inflammation in vivo by IL-1 receptor antagonist and anti-IL-1 receptor monoclonal antibody. J Exp Med. 1991; 173(4):931-939. (Biology). View Reference
557489 Rev. 10

Please refer to Support Documents for Quality Certificates

Global - Refer to manufacturer's instructions for use and related User Manuals and Technical data sheets before using this products as described

Comparisons, where applicable, are made against older BD Technology, manual methods or are general performance claims.  Comparisons are not made against non-BD technologies, unless otherwise noted.

For Research Use Only. Not for use in diagnostic or therapeutic procedures.