Biological Activity	Determined by in-house activity assay
Purity	Determined by SDS-PAGE and quantitative densitometry by Coomassie® Blue staining
Endotoxin	Determined by LAL method
Expression System	E. coli.
Accession Number	Q9HBE4
Sequence	Gln32-Ser162, with an N-terminal Met MQDRHMIRMR QLIDIVDQLK NYVNDLVPEF LPAPEDVETN CEWSAFSCFQ KAQLKSANTG NNERIINVSI KKLKRKPPST NAGRRQKHRL TCPSCDSYEK KPPKEFLERF KSLLQKMIHQ HLSSRTHGSE DS
Molecular Weight	15.4 kDa (predicted)
Formulation	Lyophilized from sterile PBS with Trehalose, pH 7.4

Shipping	Shipped at ambient temperature.
Stability & Storage	12 months from date of receipt at -20°C to -70°C, lyophilized powder. 3 months at -20°C to -70°C under sterile conditions after reconstitution. Avoid repeated freeze-thaw cycles.
Reconstitution	Reconstitute at 100 ug/mL in sterile PBS.

Alternative Names	Interleukin 21, Za11, CVID11
Function	Interleukin-21 (IL-21) is a cytokine that plays a role in coordinating immune responses and maintaining immune system balance. IL-21 is produced by NKT cells, Th17 cells and T follicular helper cells (Tfh). It functions in downregulating regulatory T (Treg) cells and modulating B cell activation and differentiation into plasma cells and memory B cells. Through the stimulation of NK cells and CD8 T cells, IL-21 is associated with antitumor activity. IL-21 signaling occurs through the heterodimer receptor complex of IL-21R (CD360) and the common gamma chain (CD132).
Tissue Specificity	IL-21 expression has been identified in spleen, lymph nodes, tonsils, thymus, gut-associated lymphoid tissue (GALT), mucosa-associated lymphoid tissue (MALT), skin, and liver.
Cellular Localization	Secreted protein
Involvement in Disease	Dysregulation of IL-21 is associated with autoimmune disorders (rheumatoid arthritis, systemic lupus erythematosus (SLE), inflammatory bowel disease (IBD)), asthma, allergic rhinitis, psoriasis, and atopic dermatitis.
UniProt	Q9HBE4
Gene Symbol	IL21
Entrez Gene ID	59067

Recombinant Human IL-21 Protein

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