- AA4.1 (See other available formats)
- Regulatory Status
- Other Names
- AA4.1, C1qRp, Early B lineage antigen
- Rat IgG2b, κ
- Ave. Rating
- Submit a Review
- Product Citations
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CD93 is a 130-140kD C-type lectin like type I transmembrane protein, also known as complement component 1, q subcomponent (C1qR1), C1qRp collectin receptor (C1qRp), or AA4 antigen. It is a receptor expressed on immature B lymphocytes, hematopoietic progenitors and stem cells in adult bone marrow, fetal liver, embryonic yolk sac. CD93 expression level on splenic immature/transitional B cells is much lower than in bone marrow. It is reinduced during plasma cell differentiation and plays an important role in maintaining plasma cells in bone marrow niches. Immature dendritic cells express CD93 and down-regulate this molecule upon maturation, suggesting a role in uptake of particles by DC. It is also expressed on monocytes, macrophages, and endothelial cells. Macrophages from CD93 (-/-) mice had a significant phagocytic defect in the clearance of apoptotic cells in vivo, indicating CD93 may contribute to the in vivo clearance of dying cells. Binding of CD93 to C1q remains controversial.Product Details
- Antibody Type
- Host Species
- Pre-B lymphoma 70Z/3
- Phosphate-buffered solution, pH 7.2, containing 0.09% sodium azide.
- The antibody was purified by affinity chromatography and conjugated with APC under optimal conditions.
- 0.2 mg/ml
- Storage & Handling
- The antibody solution should be stored undiluted between 2°C and 8°C, and protected from prolonged exposure to light. Do not freeze.
FC - Quality tested
- Recommended Usage
Each lot of this antibody is quality control tested by immunofluorescent staining with flow cytometric analysis. For flow cytometric staining, the suggested use of this reagent is ≤0.25 µg per million cells in 100 µl volume. It is recommended that the reagent be titrated for optimal performance for each application.
- Excitation Laser
Red Laser (633 nm)
(PubMed link indicates BioLegend citation)
- McKearn JP, et al. 1984. J. Immunol. 132:332
- Hanihara-Tatsuzaawa F, et al. 2014. J Biol Chem. 289:30925. PubMed
- Product Citations
AB_2275879 (BioLegend Cat. No. 136509)
AB_2275868 (BioLegend Cat. No. 136510)
- A 130-140 kD C-type lectin like type I transmembrane protein, also known as complement component 1, q subcomponent (C1qR1), C1qRp collectin receptor (C1qRp), or AA4 antigen.
- Expressed during immature B lymphocytes, hematopoietic progenitors and stem cells in bone marrow, immature dendritic cells, monocytes, macrophages, and endothelial cells.
- CD93 plays an important role in maintaining of plasma cells in bone marrow niches. It may play a role in uptake of particles by DC and the in vivo clearance of dying cells by macrophages.
- Cell Type
- B cells, Dendritic cells, Endothelial cells, Hematopoietic stem and progenitors, Macrophages, Monocytes
- Biology Area
- Cell Biology, Immunology, Innate Immunity, Neuroinflammation, Neuroscience
- Molecular Family
- CD Molecules
- Antigen References
1. Steinberger P, et al. 2002. J. Leukoc. Biol. 71:133
2. Chevrier S, et al. 2009. Proc. Nat. Acad. Sci. U. S. A. 106:3895
3. Norsworthy PJ, et al. 2004. J. Immunol. 172:3406
4. Li YS, et al. 1996. Immunity 5:527
5. Szilvassy SJ, et al. 1993. Blood 81:2310
- Gene ID
- 17064 View all products for this Gene ID
- View information about CD93 on UniProt.org
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