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AB240988

Anti-CD21 antibody [SP199] - BSA and Azide free

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(1 Publication)

Rabbit Recombinant Monoclonal CD21 antibody. Carrier free. Suitable for Flow Cyt (Intra), WB, IHC-P and reacts with Human samples. Cited in 1 publication.

View Alternative Names

CD21, C3DR, CR2, Complement receptor type 2, Cr2, Complement C3d receptor, Epstein-Barr virus receptor, EBV receptor

4 Images
Flow Cytometry (Intracellular) - Anti-CD21 antibody [SP199] - BSA and Azide free (AB240988)
  • Flow Cyt (Intra)

Supplier Data

Flow Cytometry (Intracellular) - Anti-CD21 antibody [SP199] - BSA and Azide free (AB240988)

Flow cytometric analysis of Raji (human Burkitt's lymphoma cell line) cell line labeling CD21 with ab227668 at 1/100 (green) compared with a rabbit isotype control (blue).

This data was developed using the same antibody clone in a different buffer formulation containing PBS, BSA and sodium azide (ab227668).

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-CD21 antibody [SP199] - BSA and Azide free (AB240988)
  • IHC-P

Supplier Data

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-CD21 antibody [SP199] - BSA and Azide free (AB240988)

Formalin-fixed, paraffin-embedded human tonsil tissue stained for CD21 with ab227668 at 1/100 dilution in immunohistochemical analysis.

This data was developed using the same antibody clone in a different buffer formulation containing PBS, BSA and sodium azide (ab227668).

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-CD21 antibody [SP199] - BSA and Azide free (AB240988)
  • IHC-P

Supplier Data

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-CD21 antibody [SP199] - BSA and Azide free (AB240988)

Formalin-fixed, paraffin-embedded human reactive lymph node tissue stained for CD21 with ab227668 at 1/100 dilution in immunohistochemical analysis.

This data was developed using the same antibody clone in a different buffer formulation containing PBS, BSA and sodium azide (ab227668).

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-CD21 antibody [SP199] - BSA and Azide free (AB240988)
  • IHC-P

Unknown

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-CD21 antibody [SP199] - BSA and Azide free (AB240988)

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) analysis of Human tonsil tissue sections labeling CD21 with ab227668 at 1/100 dilution (1.02 μg/ml). Heat mediated antigen retrieval with Citrate buffer (pH 6.0, epitope retrieval solution 1) for 10mins. Goat Anti-Rabbit & Mouse IgG (HRP) was used as the secondary antibody. Hematoxylin was used as a counterstain. Positive staining on the human tonsil, performed on a Leica Biosystems BOND™ RX instrument.
The section was incubated with ab227668 for 10 mins at room temperature.

This image was generated using ab227668, the same clone, but with a different buffer formulation.

Key facts

Host species

Rabbit

Clonality

Monoclonal

Clone number

SP199

Isotype

IgG

Carrier free

Yes

Reacts with

Human

Applications

Flow Cyt (Intra), WB, IHC-P

applications

Immunogen

The exact immunogen used to generate this antibody is proprietary information.

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Reactivity data

{ "title": "Reactivity Data", "filters": { "stats": ["", "Species", "Dilution Info", "Notes"], "tabs": { "all-applications": {"fullname" : "All Applications", "shortname": "All Applications"}, "FlowCytIntra" : {"fullname" : "Flow Cytometry (Intracellular)", "shortname":"Flow Cyt (Intra)"}, "WB" : {"fullname" : "Western blot", "shortname":"WB"}, "IHCP" : {"fullname" : "Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections)", "shortname":"IHC-P"} }, "product-promise": { "all": "all", "testedAndGuaranteed": "tested", "guaranteed": "expected", "predicted": "predicted", "notRecommended": "not-recommended" } }, "values": { "Human": { "FlowCytIntra-species-checked": "testedAndGuaranteed", "FlowCytIntra-species-dilution-info": "", "FlowCytIntra-species-notes": "<p></p>", "WB-species-checked": "testedAndGuaranteed", "WB-species-dilution-info": "", "WB-species-notes": "<p></p>", "IHCP-species-checked": "testedAndGuaranteed", "IHCP-species-dilution-info": "", "IHCP-species-notes": "<p>Antigen retrieval: Boil tissue section in 10mM citrate buffer, pH 6.0 for 10 minutes followed by cooling at room temperature for 20 minutes.</p>" }, "Mouse": { "FlowCytIntra-species-checked": "predicted", "FlowCytIntra-species-dilution-info": "", "FlowCytIntra-species-notes": "", "WB-species-checked": "notRecommended", "WB-species-dilution-info": "", "WB-species-notes": "<p></p>", "IHCP-species-checked": "predicted", "IHCP-species-dilution-info": "", "IHCP-species-notes": "" } } }
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Product details

ab240988 is the carrier-free version of ab227668.

What are the advantages of a recombinant monoclonal antibody?
This product is a recombinant monoclonal antibody, which offers several advantages including:

  • - High batch-to-batch consistency and reproducibility
  • - Improved sensitivity and specificity
  • - Long-term security of supply
  • - Animal-free batch production

For more information, read more on recombinant antibodies.

Conjugation ready
Our carrier-free antibodies are typically supplied in a PBS-only formulation, purified and free of BSA, sodium azide and glycerol. This conjugation-ready format is designed for use with fluorochromes, metal isotopes, oligonucleotides, and enzymes, which makes them ideal for antibody labelling, functional and cell-based assays, flow-based assays (e.g. mass cytometry) and Multiplex Imaging applications.

Use our conjugation kits for antibody conjugates that are ready-to-use in as little as 20 minutes with 1 minute hands-on-time and 100% antibody recovery: available for fluorescent dyes, HRP, biotin and gold.

Compatibility
This product is compatible with the Maxpar® Antibody Labeling Kit from Fluidigm, without the need for antibody preparation. Maxpar® is a trademark of Fluidigm Canada Inc.

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Properties and storage information

Form
Liquid
Purification technique
Affinity purification Protein A/G
Purification notes
Purified from TCS by protein A/G.
Storage buffer
pH: 7.2 - 7.4 Constituents: PBS
Shipped at conditions
Blue Ice
Appropriate short-term storage conditions
+4°C
Appropriate long-term storage conditions
+4°C
Storage information
Do Not Freeze
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Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

CD21 also known as complement receptor type 2 (CR2) or BU32 is a protein primarily expressed on the surface of B cells and some T cells. It functions as a receptor for complement component C3d EBV (Epstein-Barr Virus) and IFN-α. CD21 weighs approximately 145 kDa and belongs to the membrane protein family. Detection of CD21 can be done via immunohistochemistry (IHC) and blood tests. This marker is valuable for identifying cell populations that have roles in immune responses.
Biological function summary

Complement receptor type 2 is key in the immune system by facilitating B cell activation and proliferation. CD21 forms complexes with CD19 and CD81 increasing the sensitivity of B cells to antigens. This interaction enhances signal transduction enabling B lymphocytes to respond effectively to pathogens. The protein also plays a role in regulating immune tolerance and maintaining humoral immunity being important not only in immune defense but also in preventing autoimmunity.

Pathways

CD21 interacts with complement activation and immune response pathways. It connects with CD19 in a pivotal role where it further amplifies signaling in B lymphocytes. This interaction strengthens the downstream signaling of BCR (B cell receptor) important for antibody production. CD21 contributes to bridging the innate and adaptive immunological pathways by engaging components like C3d.

CD21 shows significant relevance in systemic lupus erythematosus (SLE) and some B cell lymphomas. Deficiencies or mutations in CD21 can lead to defective immune responses and increased susceptibility to autoimmune conditions such as SLE where CD19 is also implicated. Furthermore in Epstein-Barr Virus infections CD21 serves as an entry receptor facilitating pathogen establishment which can result in chronic conditions or even malignancies.
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Product protocols

For this product, it's our understanding that no specific protocols are required. You can visit:
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Target data

Serves as a receptor for various ligands including complement component CD3d, HNRNPU OR IFNA1 (PubMed : 1849076, PubMed : 21527715, PubMed : 7753047). When C3d is bound to antigens, attaches to C3d on B-cell surface and thereby facilitates the recognition and uptake of antigens by B-cells (PubMed : 21527715). This interaction enhances B-cell activation and subsequent immune responses. Forms a complex with several partners on the surface of B-cells including CD19, FCRL5 and CD81, to form the B-cell coreceptor complex that plays a crucial role in B-cell activation and signaling (PubMed : 1383329, PubMed : 30107486). Also induces specific intracellular signaling separately from the BCR and CD19 by activating the tyrosine kinase SRC, which then phosphorylates nucleolin/NCL and triggers AKT and GSK3 kinase activities in a SYK/CD19-independent manner (PubMed : 12938232). Acts as a ligand for CD23 (FcepsilonRII), a low-affinity receptor for IgE, which is expressed on B-cells and other immune cells, and thus participates in the regulation of IgE production (PubMed : 1386409).. (Microbial infection) Acts as a receptor for Epstein-Barr virus.
See full target information CR2
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Publications (1)

Recent publications for all applications. Explore the full list and refine your search

Cancer cell 42:444-463.e10 PubMed38428410

2024

Multi-omic profiling of follicular lymphoma reveals changes in tissue architecture and enhanced stromal remodeling in high-risk patients.

Applications

Unspecified application

Species

Unspecified reactive species

Andrea J Radtke,Ekaterina Postovalova,Arina Varlamova,Alexander Bagaev,Maria Sorokina,Olga Kudryashova,Mark Meerson,Margarita Polyakova,Ilia Galkin,Viktor Svekolkin,Sergey Isaev,Daniil Wiebe,Anna Sharun,Alexander Sarachakov,Grigory Perelman,Yaroslav Lozinsky,Ziv Yaniv,Bradley C Lowekamp,Emily Speranza,Li Yao,Stefania Pittaluga,Arthur L Shaffer,Danny Jonigk,James D Phelan,Theresa Davies-Hill,Da Wei Huang,Pavel Ovcharov,Krystle Nomie,Ekaterina Nuzhdina,Nikita Kotlov,Ravshan Ataullakhanov,Nathan Fowler,Michael Kelly,Jagan Muppidi,Jeremy L Davis,Jonathan M Hernandez,Wyndham H Wilson,Elaine S Jaffe,Louis M Staudt,Mark Roschewski,Ronald N Germain
View all publications
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Product promise

We are committed to supporting your work with high-quality reagents, and we're here for you every step of the way. In the unlikely event that one of our products does not perform as expected, you're protected by our Product Promise.
For full details, please see our Terms & Conditions

Please note: All products are 'FOR RESEARCH USE ONLY. NOT FOR USE IN DIAGNOSTIC OR THERAPEUTIC PROCEDURES'.

For licensing inquiries, please contact partnerships@abcam.com