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Key Product Details

Species Reactivity



CyTOF-ready, ELISA Capture (Matched Antibody Pair), Flow Cytometry, Neutralization, Western Blot



Antibody Source

Monoclonal Mouse IgG2A Clone # 191240

Product Summary for Human Siglec‑9 Antibody


Mouse myeloma cell line NS0-derived recombinant human Siglec-9
Gln18-Gly348 (predicted)
Accession # Q9Y336


Detects human Siglec-9 in direct ELISAs and Western blots. In direct ELISAs, less than 10% cross-reactivity with recombinant mouseSiglec‑E is observed and less than 1% cross-reactivity with recombinant human (rh) Siglec-3, rhSiglec-5, rhSiglec-6, rhSiglec-7, rhSiglec-8 or rhSiglec-10 is observed. In Western blots, approximately 100% cross-reactivity with recombinant mouse Siglec‑E is observed undernon-reduced conditions.







Scientific Data Images for Human Siglec‑9 Antibody

Detection of Siglec-9 antibody in Human Blood Granulocytes antibody by Flow Cytometry.

Detection of Siglec‑9 in Human Blood Granulocytes by Flow Cytometry.

Human peripheral blood granulocytes were stained with (A) Mouse Anti-Human Siglec-3/CD33 PE-conjugated Monoclonal Antibody (Catalog # FAB1137P) and (B) Mouse Anti-Human Siglec-9 Monoclonal Antibody (Catalog # MAB1139, filled histogram) or isotype control antibody (Catalog # MAB003, open histogram), followed by PerCP-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # F0114).
Cell Adhesion Mediated by Siglec‑9 and Neutralization by Human Siglec‑9 Antibody.

Cell Adhesion Mediated by Siglec‑9 and Neutralization by Human Siglec‑9 Antibody.

Recombinant Human Siglec-9 Fc Chimera (Catalog # 1139-SL), immobilized onto a microplate, supports the adhesion of human red blood cells in a dose-dependent manner (orange line). Adhesion elicited by Recombinant Human Siglec-9 Fc Chimera (10 µg/mL) is neutralized (green line) by increasing concentrations of Mouse Anti-Human Siglec-9 Monoclonal Antibody (Catalog # MAB1139). The ND50 is typically 0.015-0.075 µg/mL.

Applications for Human Siglec‑9 Antibody

Recommended Usage


Ready to be labeled using established conjugation methods. No BSA or other carrier proteins that could interfere with conjugation.

Flow Cytometry

0.25 µg/106 cells
Sample: Human peripheral blood granulocytes

Western Blot

1 µg/mL
Sample: Recombinant Human Siglec‑9 Fc Chimera (Catalog # 1139-SL) under non-reducing conditions only


Measured by its ability to neutralize Siglec‑9-mediated adhesion of human red blood cells. Kelm, S. et al. (1994) Current Biology 4:965. The Neutralization Dose (ND50) is typically 0.015-0.075 µg/mL in the presence of 10 µg/mL Recombinant Human Siglec‑9 Fc Chimera.

Human Siglec-9 Sandwich Immunoassay

ELISA Capture (Matched Antibody Pair)
Recommended Concentration: 2-8 µg/mL
Use in combination with these reagents:
  • Detection Reagent: Human Siglec‑9 Biotinylated Antibody (Catalog # BAF1139)
  • Standard: Recombinant Human Siglec-9 Fc Chimera Protein, CF (Catalog # 1139-SL)
Please Note: Optimal dilutions of this antibody should be experimentally determined.

Published Applications

Read 6 publications using MAB1139 in the following applications:

Formulation, Preparation, and Storage


Protein A or G purified from hybridoma culture supernatant

Endotoxin Level

<1.0 EU per 1 μg of the antibody by the LAL method.


Reconstitute at 0.5 mg/mL in sterile PBS.

Reconstitution Buffer Available:
Size / Price


Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.


The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C

Stability & Storage

Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Siglec-9

Siglecs(1) (sialic acid binding Ig-like lectins) are I-type (Ig-type) lectins belonging to the Ig superfamily. They are characterized by an N-terminal Ig-like V-type domain which mediates sialic acid binding, followed by varying numbers of Ig-like C2-type domains (1, 2). Eleven human Siglecs have been cloned and characterized. They are sialoadhesin/CD169/Siglec-1, CD22/Siglec-2, CD33/Siglec-3, Myelin-Associated Glycoprotein (MAG/Siglec-4a) and Siglec-5 to -11 (1‑4). To date, no Siglec has been shown to recognized any cell surface ligand other than sialic acids, suggesting that interactions with glycans containing this carbohydrate are important in mediating the biological functions of Siglecs. Siglecs 5 to 11 share a high degree of sequence similarity with CD33/Siglec-3 both in their extracellular and intracellular regions. They are collectively referred to as CD33-related Siglecs. One remarkable feature of the CD33-related Siglecs is their differential expression pattern within the hematopoietic system (2, 3). This fact, together with the presence of two conserved immunoreceptor tyrosine-based inhibition motifs (ITIMs) in their cytoplasmic tails, suggests that CD33-related Siglecs are involved in the regulation of cellular activation within the immune system.

The cDNA of human Siglec-9 encodes a 463 amino acid (aa) polypeptide with a hydrophobic signal peptide, an N-terminal Ig-likeV-type domain, two Ig-like C2-type domains, a transmembrane region and a cytoplasmic tail (5, 6). In peripheral blood leukocytes, Siglec-9 is expressed on neutrophils, monocytes, a fraction of NK cells, B cells, and a minor subset of CD8+ T cells (5). It binds equally well to both 2,3- and 2,6-linked sialic acid (5, 6). Siglec-9 is closely related to Siglec-7, and they share ~80% amino acid sequence identity. The gene encoding siglec-9 was mapped to chromosome 19q13.4.


  1. Crocker, P.R. et al. (1998) Glycobiology 8:v.
  2. Crocker, P.R. and A. Varki (2001) Trends Immunol. 22:337.
  3. Crocker, P.R. and A. Varki (2001) Immunology 103:137.
  4. Angata, T. et al. (2002) J. Biol. Chem. 277:24466.
  5. Zhang, J.Q. et al. (2000) J. Biol. Chem. 275:22121.
  6. Angata, T. et al. (2000) J. Biol. Chem. 275:22127.

Long Name

Sialic Acid Binding Ig-like Lectin 9

Alternate Names

CD329, OBBP-Like, Siglec9

Entrez Gene IDs

27180 (Human); 102118310 (Cynomolgus Monkey)

Gene Symbol



Product Documents for Human Siglec‑9 Antibody

Certificate of Analysis

To download a Certificate of Analysis, please enter a lot number in the search box below.

Note: Certificate of Analysis not available for kit components.

Product Specific Notices for Human Siglec‑9 Antibody

For research use only


Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

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