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RB780 Rat Anti-Mouse CD204 (SR-AI, MSR1)
Product Details
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BD OptiBuild™
SR-AI; Scara1; MSR; Msr1
Mouse (Tested in Development)
Rat IgG2b, κ
Mouse MSR1 Recombinant Protein
Flow cytometry (Qualified)
0.2 mg/ml
Aqueous buffered solution containing ≤0.09% sodium azide.

Preparation And Storage

Store undiluted at 4°C and protected from prolonged exposure to light. Do not freeze. The monoclonal antibody was purified from tissue culture supernatant or ascites by affinity chromatography. The antibody was conjugated to the dye under optimum conditions that minimize unconjugated dye and antibody.

Recommended Assay Procedures

BD® CompBeads can be used as surrogates to assess fluorescence spillover (compensation). When fluorochrome conjugated antibodies are bound to BD® CompBeads, they have spectral properties very similar to cells. However, for some fluorochromes there can be small differences in spectral emissions compared to cells, resulting in spillover values that differ when compared to biological controls. It is strongly recommended that when using a reagent for the first time, users compare the spillover on cells and BD® CompBeads to ensure that BD® CompBeads are appropriate for your specific cellular application.

Product Notices

  1. When using high concentrations of antibody, background binding of this dye to erythroid fragments produced by ammonium chloride-based lysis, such as with BD Pharm Lyse™ Lysing Buffer (Cat. No. 555899), has been observed when the antibody conjugate was present during the lysis procedure. This may cause nonspecific staining of target cells, such as leukocytes, which have bound the resulting erythroid fragments. This background can be mitigated by any of the following: titrating the antibody conjugate to a lower concentration, fixing samples with formaldehyde, or removing erythrocytes before staining (eg, gradient centrifugation or pre-lysis with wash). This background has not been observed when cells were lysed with BD FACS™ Lysing Solution (Cat. No. 349202) after staining.
  2. Researchers should determine the optimal concentration of this reagent for their individual applications.
  3. The production process underwent stringent testing and validation to assure that it generates a high-quality conjugate with consistent performance and specific binding activity. However, verification testing has not been performed on all conjugate lots.
  4. Please refer to for technical protocols.
  5. Please observe the following precautions: Absorption of visible light can significantly alter the energy transfer occurring in any tandem fluorochrome conjugate; therefore, we recommend that special precautions be taken (such as wrapping vials, tubes, or racks in aluminum foil) to prevent exposure of conjugated reagents, including cells stained with those reagents, to room illumination.
  6. An isotype control should be used at the same concentration as the antibody of interest.
  7. 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.
  8. Please refer to to access safety data sheets (SDS).
  9. For fluorochrome spectra and suitable instrument settings, please refer to our Multicolor Flow Cytometry web page at
  10. Since applications vary, each investigator should titrate the reagent to obtain optimal results.
  11. Cy is a trademark of Global Life Sciences Solutions Germany GmbH or an affiliate doing business as Cytiva.
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Antibody Details
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The 268318 monoclonal antibody specifically recognizes CD204 which is also known as Scavenger receptor class A member 1 (SR-A1 or SCARA1), Scavenger receptor type A (SRA-A), Macrophage acetylated LDL receptor I and II, or Macrophage scavenger receptor types I and II. CD204 is a trimeric type II transmembrane glycoprotein that is encoded by MSR1 (Msr1 macrophage scavenger receptor 1) which belongs to the type 1 class A scavenger receptor family. The C-terminal extracellular region of CD204 contains a scavenger receptor cysteine-rich domain followed by a collagen domain and an alpha-helical coiled coil. It is expressed on monocytes, macrophages, microglia, dendritic cells, and mast cells. CD204 is involved in the uptake of various negatively-charged macromolecules including modified proteins, polysaccharides, polyribonucleic acids, and microbial products and plays a role in innate and acquired immunity.

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Format Details
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The BD Horizon RealBlue™ 780 (RB780) Dye is part of the BD family of blue dyes. It is a tandem fluorochrome with an excitation maximum (Ex Max) at 498-nm and an emission maximum (Em Max) at 781-nm. Driven by BD innovation, RB780 can be used on both spectral and conventional cytometers and is designed to be excited by the Blue laser (488-nm) with minimal excitation by the 561-nm Yellow-Green laser. For conventional instruments equipped with a Blue laser (488-nm), RB780 can be used as an alternative to PE-Cy7 and we recommend using an optical filter centered near 780-nm (eg, a 780/60-nm bandpass filter). For spectral instruments equipped with a Blue laser (488-nm), it can be used in conjunction with PE-Cy7. RB780 is on average brighter than PE-Cy7 and has minimal spillover into Yellow-Green detectors.
Blue 488 nm
498 nm
781 nm
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Citations & References
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Development References (3)

  1. Cavnar MJ, Zeng S, Kim TS, et al. KIT oncogene inhibition drives intratumoral macrophage M2 polarization.. J Exp Med. 2013; 210(13):2873-86. (Clone-specific: Flow cytometry). View Reference
  2. Freeman M, Ashkenas J, Rees DJ, et al. An ancient, highly conserved family of cysteine-rich protein domains revealed by cloning type I and type II murine macrophage scavenger receptors.. Proc Natl Acad Sci USA. 1990; 87(22):8810-4. (Biology). View Reference
  3. PrabhuDas MR, Baldwin CL, Bollyky PL, et al. A Consensus Definitive Classification of Scavenger Receptors and Their Roles in Health and Disease.. J Immunol. 2017; 198(10):3775-3789. (Biology). View Reference
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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.