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Regulatory Status
Other Names
IL-21 Pre-coated ELISA Kit
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Product Citations
  • Human_IL-21_carrfree_092010
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433807 1 Pre-coated Plate 370€
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Human IL-21 is a 4-helix-bundle-type fold cytokine with significant homology to IL-2, IL-4, and IL-15. IL-21 is produced most abundantly by activated CD4+ T cells, including Th17 lineage cells and natural killer T (NKT) cells, and has pleiotropic effects on both innate and adaptive immune responses. These actions include positive effects such as enhanced proliferation of NK cells and cytotoxic T cells that can destroy virally infected or cancerous cells and direct inhibitory effects on the antigen-presenting function of dendritic cells. It can also be proapoptotic for B cells and NK cells.

BioLegend’s LEGEND MAX™ Human IL-21 ELISA Kit is a sandwich Enzyme-Linked Immunosorbent Assay (ELISA), in which, a human IL-21 specific monoclonal antibody is pre-coated on a 96-well strip-well plate.
This Human IL-21 ELISA Kit is specifically designed for the accurate quantitation of human IL-21 from cell culture supernatant, serum, plasma, and other bodily fluids. It is ready-to-use, accurate, and sensitive.

Product Details
Technical Data Sheet (pdf)

Kit Contents

Kit Contents
  • Anti-Human IL-21 Pre-coated 96-well Strip Microplate
  • Human IL-21 Dectection Antibody
  • Human IL-21 Standard
  • Avidin-HRP D
  • Assay Buffer A
  • Wash Buffer (20X)
  • Substrate Solution E
  • Stop Solution
  • Plate Sealers

Product Details

Verified Reactivity


Application References
  1. Isaza-Guzman DM, et al. 2015. Arch Oral Biol. 60:91. PubMed
Product Citations
  1. Wang T, et al. 2016. Vascular Med. 21: 99-104. PubMed
  2. Wang Y, et al. 2020. Ann Transl Med. 8:1369. PubMed
  3. Isaza-Guzmán D, et al. 2015. Arch Oral Biol. 60:91. PubMed
4.2 pg/mL
Standard Range
31.3-2,000 pg/mL
Materials Not Included
  • Microplate reader able to measure absorbance at 450 nm
  • Adjustable pipettes to measure volumes ranging from 1 µL to 1,000 µL
  • Deionized water
  • Wash bottle or automated microplate washer
  • Log-Log graph paper or software for data analysis
  • Tubes to prepare standard dilutions
  • Timer
  • Plate Shaker
  • Polypropylene vials

Antigen Details

Cell Sources
NK-T cells and T cells
Biology Area
Immunology, Innate Immunity
Molecular Family
Gene ID
59067 View all products for this Gene ID
View information about IL-21 on UniProt.org

Related FAQs

In your LEGEND MAX™ ELISA Kits, there is a step that calls for washing the plates before adding sample. What is the purpose of this step?

We typically use a stabilizer for pre-coated plates. The additional washing step is designed to remove these components before you start the assay. If you do not perform the washing, the effect on assay performance is negligible.

I have multiple LEGEND MAX™ ELISA kits that I want to run simultaneously. Can I use the same wash buffer for all the kits?

The wash buffer provided in all our LEGEND MAX™ kits is the same and the part numbers on the wash buffer bottles in these kits should be identical. For ELISA MAX™ Deluxe and ELISA MAX™ Standard Sets, we provide a recipe for the wash buffer on each kit’s technical data sheet. This recipe is the same for all ELISA MAX™ sets.

For some of your ELISA kits, why do my serum samples require dilution with assay buffer?

In some cases, dilution with assay buffer is required to minimize the matrix difference between the samples and the standards to achieve better accuracy.

Go To Top Version: 3    Revision Date: 10/05/2023

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.


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