Synonyms: Interleukin-21, IL-21, Za11

Accession: Q9HBE4

Description：Hunan IL-21 protein is a molecule that is found in the immune system of individuals. It is a type of interleukin, which is a protein that helps in the communication between immune cells. IL-21 plays a crucial role in regulating the body's immune response, specifically in the development, differentiation, and function of certain immune cells, such as T cells and natural killer cells.

Source: HEK293 cells-derived human IL-21 protein, Gln30-Ser162, with N-terminal Flag tag.

Purity: ≥90% as determined by SDS-PAGE.

Endotoxin: < 1 EU per 1μg of the protein by the LAL method.

Predicted N terminal: Met.

Molecular Mass: The recombinant human IL-21 consists of 140 amino acids and has a calculated molecular mass of 16.5 kDa. And it migrates as 17-19 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.

Formulation: Supplied as sterile PBS, pH 7.4.

SDS-PAGE: 

The ED₅₀ as determined by a cell proliferation assay using PHA-activated human peripheral blood lymphocytes (PBL) is less than 150 ng/mL, corresponding to a specific activity of >6.6× 10³ IU/mg. Fully biologically active when compared to standard.

Handling: Centrifuge vial prior to opening.

Do not vortex after reconstitution.

Avoid repeated freeze-thaw cycles.

Reconstitution: Initially reconstitute in water to 0.1-1.0 mg/ml. Store at 2℃ to 8℃ for up to 1 week or prepare for extended storage.

Extended Storage: After initial reconstitution, further dilute in a buffer containing a carrier protein or stabilizer (e.g. 0.1% BSA). Store working aliquots at -20℃ to 80℃.

Storage/Stability: