- GK1.5 (See other available formats)
- Regulatory Status
- Other Names
- L3T4, T4
- Rat IgG2b, κ
- Ave. Rating
- Submit a Review
- Product Citations
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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
- Verified Reactivity
- Antibody Type
- Host Species
- Mouse CTL clone V4
- Phosphate-buffered solution, pH 7.2, containing 0.09% sodium azide.
- The antibody was purified by affinity chromatography, and conjugated with PE/Cyanine5 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 ≤0.06 µg per million cells in 100 µl volume. It is recommended that the reagent be titrated for optimal performance for each application.
- Excitation Laser
Blue Laser (488 nm)
Green Laser (532 nm)/Yellow-Green Laser (561 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
- BioLegend is in the process of converting the name PE/Cy5 to PE/Cyanine5. The dye molecule remains the same, so you should expect the same quality and performance from our PE/Cyanine5 products. Please contact Technical Service if you have any questions.
(PubMed link indicates BioLegend citation)
- Dialynas DP, et al. 1983. J. Immunol. 131:2445. (Block, IP)
- Dialynas DP, et al. 1983. Immunol. Rev. 74:29. (IP, Deplete)
- Wu L, et al. 1991. J. Exp. Med. 174:1617. (Costim)
- Godfrey DI, et al. 1994. J. Immunol. 152:4783. (Block)
- Gavett SH, et al. 1994. Am. J. Respir. Cell. Mol. Biol. 10:587. (Deplete)
- Schuyler M, et al. 1994. Am. J. Respir. Crit. Care Med. 149:1286. (Deplete)
- Ghobrial RR, et al. 1989. Clin. Immunol. Immunopathol. 52:486. (Deplete)
- Israelski DM, et al. 1989. J. Immunol. 142:954. (Deplete)
- Zheng B, et al. 1996. J. Exp. Med. 184:1083. (IHC)
- Frei K, et al. 1997. J. Exp. Med. 185:2177. (IHC)
- Felix NJ, et al. 2007. Nat. Immunol. 8:388. (Block)
- Radtke AJ, et al. 2020. Proc Natl Acad Sci U S A. 117:33455-65. (SB) PubMed
- Radtke AJ, et al. 2022. Nat Protoc. 17:378-401. (SB) PubMed
- Product Citations
AB_312694 (BioLegend Cat. No. 100409)
AB_312695 (BioLegend Cat. No. 100410)
- Ig superfamily, 55 kD
Majority of thymocytes, T cell subset
- TCR co-receptor, T cell activation
- MHC class II molecule
- Cell Type
- Dendritic cells, T cells, Thymocytes, Tregs
- Biology Area
- 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
- 12504 View all products for this Gene ID
- View information about CD4 on UniProt.org
- 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.
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Compare Data Across All Formats
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.
APC anti-mouse CD4
Biotin anti-mouse CD4
FITC anti-mouse CD4
PE anti-mouse CD4
PE/Cyanine5 anti-mouse CD4
Purified anti-mouse CD4
PE/Cyanine7 anti-mouse CD4
APC/Cyanine7 anti-mouse CD4
Alexa Fluor® 647 anti-mouse CD4
Alexa Fluor® 488 anti-mouse CD4
Pacific Blue™ anti-mouse CD4
Alexa Fluor® 700 anti-mouse CD4
PerCP anti-mouse CD4
PerCP/Cyanine5.5 anti-mouse CD4
Brilliant Violet 421™ anti-mouse CD4
Ultra-LEAF™ Purified anti-mouse CD4
Alexa Fluor® 594 anti-mouse CD4
Brilliant Violet 711™ anti-mouse CD4
Brilliant Violet 510™ anti-mouse CD4
Brilliant Violet 605™ anti-mouse CD4
Brilliant Violet 785™ anti-mouse CD4
PE/Dazzle™ 594 anti-mouse CD4
APC/Fire™ 750 anti-mouse CD4
GoInVivo™ Purified anti-mouse CD4
Brilliant Violet 750™ anti-mouse CD4
Brilliant Violet 650™ anti-mouse CD4
Spark Blue™ 550 anti-mouse CD4
Spark NIR™ 685 anti-mouse CD4
KIRAVIA Blue 520™ anti-mouse CD4
PE/Fire™ 640 anti-mouse CD4
APC/Fire™ 810 anti-mouse CD4
PE/Fire™ 700 anti-mouse CD4
Spark Violet™ 538 anti-mouse CD4
Spark YG™ 593 anti-mouse CD4
Spark Blue™ 574 anti-mouse CD4 Antibody
Spark UV™ 387 anti-mouse CD4