Recombinant Human IL-21 Protein, CF Best Seller

Name: Recombinant Human IL-21 Protein, CF
Brand: R&D Systems
SKU: BT-021

R&D Systems, part of Bio-Techne | Catalog # BT-021

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Key Product Details

Source:	E. coli
Accession #:	Q9HBE4.3

View Full Technical Details for Recombinant Human IL-21 Protein, CF

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Product Specifications for Recombinant Human IL-21 Protein, CF

Source	E. coli-derived human IL-21 protein Gln32-Ser162 with a N-terminal Met
Endotoxin level	<0.10 EU per 1 μg of the protein by the LAL method.
N-terminal sequence Analysis	Met
Predicted Molecular Mass	15 kDa
SDS-PAGE	15 kDa
Activity	Measured in a cell proliferation assay using B9 mouse hybridoma cells. The ED₅₀ for this effect is 5.00-50.0 ng/mL.

Scientific Data Examples for Recombinant Human IL-21 Protein, CF

	Recombinant Human IL‑21 Protein Bioactivity. Recombinant Human IL-21 induces cell proliferation of B9 mouse hybridoma cells with an ED₅₀ of 5.00-50.0 ng/mL.
	Recombinant Human IL‑21 Protein SDS-PAGE. 2 μg/lane of Recombinant Human IL‑21 Protein (Catalog # BT-021) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 15-17 kDa, under reducing conditions.

Formulation, Preparation and Storage

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

BT-021

Formulation	Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. See Certificate of Analysis for details.
Reconstitution	Reconstitute the 10 μg size at 100 μg/mL in PBS. Reconstitute all other sizes at 500 μg/mL in PBS.
Shipping	The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage:	Use a manual defrost freezer and avoid repeated freeze-thaw cycles. 12 months from date of receipt, -20 to -70 °C as supplied. 1 month, 2 to 8 °C under sterile conditions after reconstitution. 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

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Background: IL-21

IL-21 (Interleukin-21) is member of the family of cytokines that utilize the common gamma chain as a receptor subunit. This subunit is also a component of the receptors for IL-2, IL-4, IL-7, IL-9, and IL-15. IL-21 is produced by activated T follicular helper cells (Tfh), Th17 cells, and NKT cells. It exerts its biological effects through a heterodimeric receptor complex of the common gamma chain and the IL-21-specific IL-21 R. IL-21 supports Tfh cell development, immunoglobulin affinity maturation, plasma cell differentiation, B cell memory responses, and the migration of dendritic cells to draining lymph nodes. It costimulates the activation, proliferation, and survival of CD8+ T cells and NKT cells and promotes Th17 cell polarization. It blocks the generation of regulatory T cells and their suppressive effects on CD4+ T cells. In addition, IL-21 suppresses cutaneous hypersensitivity reactions by limiting allergen-specific IgE production and mast cell degranulation.

Item	Value
Long Name	Interleukin 21
Entrez Gene IDs	59067 (Human); 60505 (Mouse); 365769 (Rat); 442935 (Canine); 100344172 (Rabbit)
Alternate Names	CVID11, IL-21, IL-21Za11interleukin-21, IL21, Za11, interleukin 21, interleukin-21 isoform

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Recombinant Human IL-21 Protein, CF Best Seller

R&D Systems, part of Bio-Techne | Catalog # BT-021

Key Product Details

Product Specifications for Recombinant Human IL-21 Protein, CF

Scientific Data Examples for Recombinant Human IL-21 Protein, CF

Formulation, Preparation and Storage

Carrier Free

Reconstitution Calculator

Background: IL-21

Customer Reviews for Recombinant Human IL-21 Protein, CF

Product Documents for Recombinant Human IL-21 Protein, CF

Product Datasheets

COA

Certificate of Analysis

SDS

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