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BD Horizon™ R718 Mouse Anti-Human Siglec-9 (CD329)
Clone K8 (RUO)


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Multiparameter flow cytometric analysis of Siglec-9 (CD329) expression on Human peripheral blood leucocyte populations. Human whole blood was first treated with BD Pharm Lyse™ Lysing Buffer (Cat. No. 555899) to lyse erythrocytes, washed, and then preincubated with BD Pharmingen™ Human BD Fc Block™ (Cat. No. 564219/564220). The leucocytes were then stained with either BD Horizon™ R718 Mouse IgG1, κ Isotype Control (Cat. No. 566928; Left Plot) or BD Horizon™ R718 Mouse Anti-Human Siglec-9 (CD329) antibody (Cat. No. 569484/569485; Right Plot). The bivariate pseudocolor density plot showing the correlated expression of Siglec-9 (CD329) [or Ig Isotype control staining] versus side light-scatter (SSC-A) signals was derived from gated events with the forward and side light-scatter characteristics of viable leucocytes. Flow cytometry and data analysis were performed using a BD LSRFortessa™ X-20 Cell Analyzer System and FlowJo™ software.
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BD Horizon™ R718 Mouse Anti-Human Siglec-9 (CD329)
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Regulatory Status Legend
Any use of products other than the permitted use without the express written authorization of Becton, Dickinson and Company is strictly prohibited.
Preparation And Storage
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.
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- Please refer to www.bdbiosciences.com/us/s/resources for technical protocols.
- This reagent has been pre-diluted for use at the recommended Volume per Test. We typically use 1 × 10^6 cells in a 100-µl experimental sample (a test).
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Companion Products


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The K8 monoclonal antibody specifically recognizes Sialic acid-binding Ig-like lectin 9 (Siglec-9) which is also known as CD329. Siglec-9 (CD329) is a single-pass type I transmembrane glycoprotein that is encoded by SIGLEC9 which belongs to the I-type lectins within the Ig superfamily. This lectin is comprised of an N-terminal extracellular region that contains an IgV domain, which binds sialic acid, followed by two Ig-like C2-type domains, a transmembrane region, and an intracellular domain with an immunoreceptor tyrosine-based inhibitory motif (ITIM) and an ITIM-like motif . It is highly expressed on monocytes, neutrophils, and expressed at lower levels on a proportion of NK cells, B cells and T cells. Siglec-9 (CD329) may play roles in the regulation of T cell and NK cell responses and neutrophil apoptosis.

Development References (5)
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Avril T, Floyd H, Lopez F, Vivier E, Crocker PR. The membrane-proximal immunoreceptor tyrosine-based inhibitory motif is critical for the inhibitory signaling mediated by Siglecs-7 and -9, CD33-related Siglecs expressed on human monocytes and NK cells.. J Immunol. 2004; 173(11):6841-9. (Clone-specific: Flow cytometry, Functional assay). View Reference
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Carlin AF, Uchiyama S, Chang YC, Lewis AL, Nizet V, Varki A. Molecular mimicry of host sialylated glycans allows a bacterial pathogen to engage neutrophil Siglec-9 and dampen the innate immune response. Blood. 2009; 113(14):3333-3336. (Biology). View Reference
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Fraschilla I, Pillai S. Viewing Siglecs through the lens of tumor immunology.. Immunol Rev. 2017; 276(1):178-191. (Biology). View Reference
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Nguyen DH, Hurtado-Ziola N, Gagneux P, Varki A. Loss of Siglec expression on T lymphocytes during human evolution.. Proc Natl Acad Sci U S A. 2006; 103(20):7765-70. (Biology). View Reference
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Zhang JQ, Nicoll G, Jones C, Crocker PR. Siglec-9, a novel sialic acid binding member of the immunoglobulin superfamily expressed broadly on human blood leukocytes.. J Biol Chem. 2000; 275(29):22121-6. (Immunogen: Flow cytometry). View Reference
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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.