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Spark Red™ 718 anti-mouse CD4 (Flexi-Fluor™) Antibody

Pricing & Availability
Clone
GK1.5 (See other available formats)
Regulatory Status
RUO
Other Names
L3T4, T4
Isotype
Rat IgG2b, κ
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Product Citations
publications
Compare all formats See Spark Red™ 718 spectral data
Cat # Size Price Quantity Save
285218 50 µg 231€
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Description

CD4 is a 55 kD protein also known as L3T4 or T4. It is a member of the Ig superfamily, primarily expressed on most thymocytes, a subset of T cells, and weakly on macrophages and dendritic cells. It acts as a coreceptor with the TCR during T cell activation and thymic differentiation by binding MHC class II and associating with the protein tyrosin kinase, lck.

Product Details
Technical Data Sheet (pdf)

Product Details

Verified Reactivity
Mouse
Antibody Type
Monoclonal
Host Species
Rat
Immunogen
Mouse CTL clone V4
Formulation
Phosphate-buffered solution, pH 7.2, containing 0.09% sodium azide
Preparation
The antibody was purified by affinity chromatography and conjugated with Spark Red™ 718 under optimal conditions.
Concentration
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.
Application

FC
Recommended Usage

Flexi-Fluors™ are provided at a standard 0.2 mg/mL concentration. We recommend titrating this reagent to determine the optimal concentration for each application. For many flow cytometry applications, conjugated antibodies perform well at concentrations ranging from 0.03 to 1.0 µg per million cells in 100 µL. We recommend testing a range of concentrations starting from 10 µg/mL.

For example, make five 1:1 serial dilutions of the 0.2 mg/mL antibody. Add 5 µL of each dilution (including the undiluted antibody) to 100 µL of cells (at 107 cells/mL) to test six concentrations -- 1.0, 0.5, 0.25, 0.125, 0.06, and 0.03 µg per million cells in 100 µL volume. Compare staining patterns or create a titration curve using the MFI or staining index to determine the optimal concentration.

Excitation Laser
Red Laser (633 nm)
Application Notes

Additional reported applications (for the relevant formats) include: blocking of CD4+ T cell activation1,4,11, thymocyte costimulation3, in vitro and in vivo depletion2,5-8, blocking of egg-sperm cell adhesion1,4, immunohistochemical staining of acetone-fixed frozen sections9,10, immunoprecipitation1,2, and spatial biology (IBEX)12,13. The GK1.5 antibody is able to block CD4 mediated cell adhesion and T cell activation. Binding of GK1.5 antibody to CD4 T cells can be blocked by RM4-5 antibody, but not RM4-4 antibody. For in vivo studies or highly sensitive assays, we recommend Ultra-LEAF™ purified antibody (Cat. No. 100442) with a lower endotoxin limit than standard LEAF™ purified antibodies (Endotoxin < 0.01 EU/µg).

Additional Product Notes

For more information about Flexi-Fluors™, visit our Flexi-Fluor™ page and review FAQs associated with this product line.

Application References
  1. Dialynas DP, et al. 1983. J. Immunol. 131:2445. (Block, IP)
  2. Dialynas DP, et al. 1983. Immunol. Rev. 74:29. (IP, Deplete)
  3. Wu L, et al. 1991. J. Exp. Med. 174:1617. (Costim)
  4. Godfrey DI, et al. 1994. J. Immunol. 152:4783. (Block)
  5. Gavett SH, et al. 1994. Am. J. Respir. Cell. Mol. Biol. 10:587. (Deplete)
  6. Schuyler M, et al. 1994. Am. J. Respir. Crit. Care Med. 149:1286. (Deplete)
  7. Ghobrial RR, et al. 1989. Clin. Immunol. Immunopathol. 52:486. (Deplete)
  8. Israelski DM, et al. 1989. J. Immunol. 142:954. (Deplete)
  9. Zheng B, et al. 1996. J. Exp. Med. 184:1083. (IHC)
  10. Frei K, et al. 1997. J. Exp. Med. 185:2177. (IHC)
  11. Felix NJ, et al. 2007. Nat. Immunol. 8:388. (Block)
  12. Radtke AJ, et al. 2020. Proc Natl Acad Sci U S A. 117:33455-65. (SB) PubMed
  13. Radtke AJ, et al. 2022. Nat Protoc. 17:378-401. (SB) PubMed
RRID
AB_3662454 (BioLegend Cat. No. 285218)

Antigen Details

Structure
Ig superfamily, 55 kD
Distribution

Majority of thymocytes, T cell subset

Function
TCR co-receptor, T cell activation
Ligand/Receptor
MHC class II molecule
Cell Type
Dendritic cells, T cells, Thymocytes, Tregs
Biology Area
Immunology
Molecular Family
CD Molecules
Antigen References

1. Barclay A, et al. 1997. The Leukocyte Antigen FactsBook Academic Press.
2. Bierer BE, et al. 1989. Annu. Rev. Immunol. 7:579.
3. Janeway CA. 1992. Annu. Rev. Immunol. 10:645.

Gene ID
NA
UniProt
View information about CD4 on UniProt.org

Related FAQs

I am unable to see expression of T cell markers such as CD3 and CD4 post activation.
TCR-CD3 complexes on the T-lymphocyte surface are rapidly downregulated upon activation with peptide-MHC complex, superantigen or cross-linking with anti-TCR or anti-CD3 antibodies. PMA/Ionomycin treatment has been shown to downregulate surface CD4 expression. Receptor downregulation is a common biological phenomenon and so make sure that your stimulation treatment is not causing it in your sample type.
What are Flexi-Fluors?

Flexi-Fluors are rapidly made-to-order conjugated antibodies. The technology, manufacturing processes, and specifications used to create Flexi-Fluors are the same as our regular catalog products. However, the optimal concentration and performance of each Flexi-Fluor must be determined by the customer. 

How quickly will I receive my order?

We aim to ship Flexi-Fluors within 2-3 weeks of receipt of your order. However, depending on your location, shipping times may vary. 

How are Flexi-Fluors different from regular catalog products?

Flexi-Fluors are made on demand, specifically for you. Flexi-Fluors are manufactured using the same high-quality standards, and specifications as other catalog products. For faster delivery, Flexi-Fluors are not tested by flow cytometry to determine optimal concentrations or evaluate performance. This testing needs to be performed by the customer.

How do I determine the optimal concentration for using my Flexi-Fluor? How should I titrate my antibody?

Flexi-Fluors are provided at a standard 0.2 mg/mL concentration. We recommend that you titrate your antibody to determine the optimal concentration to use for your application. For many flow cytometry applications, conjugated antibodies perform well at concentrations ranging from 0.03 to 1.0 µg per million cells in 100 µL volume. We recommend that you test a range of concentrations starting from 10 µg/mL. 

 

For example, make five 1:1 serial dilutions of your 0.2 mg/mL antibody.  Add 5 µL of each dilution (including the undiluted antibody) to 100 µL of cells (at 107 cells/ml) to test six concentrations - 1.0, 0.5, 0.25, 0.125, 0.06, and 0.03 µg per million cells in 100 µL volume. Compare staining patterns or create a titration curve using the MFI or staining index to determine the optimal concentration. 

I can’t find the antibody-dye combination that I need. When will it be available?

We continuously update our catalog, introducing scores of new products every month. Please get in touch with our Technical Service team for an update on new products or recommendations for suitable alternatives to complete your panel. Or contact Custom Solutions to inquire about our affordable custom conjugation services. 

I need help to validate the performance of my Flexi-Fluor. Who should I contact?

Please get in touch with Technical Service for assistance. 

Can I order more than 50 μg of a Flexi-Fluor?

Yes, you can order multiple vials of the same Flexi-Fluor products.  We cannot guarantee, however, that these vials will be bottled from the same lot. For bulk single-lot orders, contact our Custom Solutions team.

What is the expiration date of my Flexi-Fluor?

Expiration dates can be found on the vial label or by using our CoA lookup tool. 

Other Formats

View All CD4 Reagents Request Custom Conjugation
Description Clone Applications
APC anti-mouse CD4 GK1.5 FC
Biotin anti-mouse CD4 GK1.5 FC,IHC-F,ICC
FITC anti-mouse CD4 GK1.5 FC,IHC-F,ICC
PE anti-mouse CD4 GK1.5 FC
PE/Cyanine5 anti-mouse CD4 GK1.5 FC
Purified anti-mouse CD4 GK1.5 FC,IHC-F,ICC,IP,Costim,Block,Depletion
PE/Cyanine7 anti-mouse CD4 GK1.5 FC
APC/Cyanine7 anti-mouse CD4 GK1.5 FC
Alexa Fluor® 647 anti-mouse CD4 GK1.5 FC,IHC-F,ICC
Alexa Fluor® 488 anti-mouse CD4 GK1.5 FC,IHC-F,ICC
Pacific Blue™ anti-mouse CD4 GK1.5 FC
Alexa Fluor® 700 anti-mouse CD4 GK1.5 FC
PerCP anti-mouse CD4 GK1.5 FC
PerCP/Cyanine5.5 anti-mouse CD4 GK1.5 FC
Brilliant Violet 421™ anti-mouse CD4 GK1.5 FC,ICC,IHC-F
Ultra-LEAF™ Purified anti-mouse CD4 GK1.5 FC,Block,Costim,Depletion,IHC,IP
Alexa Fluor® 594 anti-mouse CD4 GK1.5 IHC-F,FC,ICC,SB
Brilliant Violet 711™ anti-mouse CD4 GK1.5 FC
Brilliant Violet 510™ anti-mouse CD4 GK1.5 FC,IHC-F,ICC
Brilliant Violet 605™ anti-mouse CD4 GK1.5 FC
Brilliant Violet 785™ anti-mouse CD4 GK1.5 FC
PE/Dazzle™ 594 anti-mouse CD4 GK1.5 FC
APC/Fire™ 750 anti-mouse CD4 GK1.5 FC
GoInVivo™ Purified anti-mouse CD4 GK1.5 FC
Brilliant Violet 750™ anti-mouse CD4 GK1.5 FC
Brilliant Violet 650™ anti-mouse CD4 GK1.5 FC
Spark Blue™ 550 anti-mouse CD4 GK1.5 FC
Spark NIR™ 685 anti-mouse CD4 GK1.5 FC
KIRAVIA Blue 520™ anti-mouse CD4 GK1.5 FC
PE/Fire™ 640 anti-mouse CD4 GK1.5 FC
APC/Fire™ 810 anti-mouse CD4 GK1.5 FC
PE/Fire™ 700 anti-mouse CD4 GK1.5 FC
Spark Violet™ 538 anti-mouse CD4 GK1.5 FC
Spark YG™ 593 anti-mouse CD4 GK1.5 FC
Spark Blue™ 574 anti-mouse CD4 Antibody GK1.5 FC
Spark UV™ 387 anti-mouse CD4 GK1.5 FC
Spark Blue™ 515 anti-mouse CD4 GK1.5 FC
Spark PLUS UV395™ anti-mouse CD4 GK1.5 FC
Spark Red™ 718 anti-mouse CD4 (Flexi-Fluor™) GK1.5 FC
Go To Top Version: 0    Revision Date: 01-01-0001

For Research Use Only. Not for diagnostic or therapeutic use.

 

This product is supplied subject to the terms and conditions, including the limited license, located at www.biolegend.com/terms) ("Terms") and may be used only as provided in the Terms. Without limiting the foregoing, BioLegend products may not be used for any Commercial Purpose as defined in the Terms, resold in any form, used in manufacturing, or reverse engineered, sequenced, or otherwise studied or used to learn its design or composition without express written approval of BioLegend. Regardless of the information given in this document, user is solely responsible for determining any license requirements necessary for user’s intended use and assumes all risk and liability arising from use of the product. BioLegend is not responsible for patent infringement or any other risks or liabilities whatsoever resulting from the use of its products.

 

BioLegend, the BioLegend logo, and all other trademarks are property of BioLegend, Inc. or their respective owners, and all rights are reserved.

 

8999 BioLegend Way, San Diego, CA 92121 www.biolegend.com
Toll-Free Phone: 1-877-Bio-Legend (246-5343) Phone: (858) 768-5800 Fax: (877) 455-9587

This data display is provided for general comparisons between formats.
Your actual data may vary due to variations in samples, target cells, instruments and their settings, staining conditions, and other factors.
If you need assistance with selecting the best format contact our expert technical support team.

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