| Field | Specification |
|---|---|
| Target | |
| Alternative names | Interleukin-21; IL-21; Il21 |
| UniProt # | |
| Host | |
| Clonality | |
| Isotype | |
| Reactivity | |
| Applications | |
| Immunogen | E.coli-derived mouse IL-21/Il21 recombinant protein (Position: H18-S146). |
| Molecular weight | |
| Purification | |
| Reconstitution | |
| Cellular localization | |
| Concentration | |
| Form | Lyophilized |
| Storage | |
| Catalog no. (Mfr.) | |
| Main SKU |
Product Overview
This rabbit polyclonal antibody recognizes interleukin-21 (gene Il21) in mouse and rat samples and is validated for IHC and ELISA. The predicted molecular weight is 16.8 kDa.
Interleukin-21 (IL-21) is a cytokine made largely by activated CD4+ T cells, including T follicular helper cells. In mice it supports Tfh cell development, germinal center formation and B-cell antibody class switching, and it works with IL-15 to promote NK-cell and T-cell responses. It is widely studied in humoral immunity and antiviral defense.
| Target | Interleukin-21 (gene Il21; UniProt Q9ES17, mouse) |
|---|---|
| Host / Clonality / Isotype | Rabbit / Polyclonal / Rabbit IgG |
| Reactivity | Mouse, Rat |
| Form | Lyophilized |
| Formulation | Per vial: 4 mg trehalose; 0.9 mg NaCl; 0.2 mg Na2HPO4; 0.005 mg NaN3 |
| Calculated MW | 16.8 kDa |
| Storage | As supplied: −20 °C for up to 12 months from receipt. After reconstitution: 4 °C for up to 1 month, or aliquot and keep at −20 °C for up to 6 months. Avoid repeated freeze–thaw cycles. |
Validated Applications
| IHC (paraffin sections) | 2–5 µg/mL (Mouse, Rat) |
|---|---|
| ELISA | 0.1–0.5 µg/mL |
Samples with confirmed staining (IHC): mouse spleen tissue, rat spleen tissue.
Recommended antigen retrieval: heat-mediated, in TE buffer (pH 9.0); citrate buffer (pH 6.0) can be used instead.
Conditions in the example images (IHC): heat-mediated antigen retrieval in EDTA buffer (pH 8.0).
Immunogen
Recombinant mouse IL-21/Il21 fragment (His18–Ser146), expressed in E. coli.
Reactivity Notes
The supplier lists reactivity with mouse and rat. UniProt describes interleukin-21 as a secreted protein. Tissue expression noted by UniProt (mouse): Expressed in CD4(+) T cells.
Safety
Customization & Add-ons: Can’t find the antibody you need—or require a custom format for your assay? We can help you source the best match or support custom antibody solutions for diverse research needs, including species and isotype selection, conjugations and labeling (e.g., HRP/AP, biotin, fluorophores), purification grade options (Protein A/G, affinity purified), formulation preferences (buffer selection, carrier-free, glycerol-free), custom concentrations and aliquoting, low-endotoxin options for cell-based work, and application-focused QC/validation support (project dependent). Click Talk to a Scientist to submit a request, email us at support@biohippo.com, or explore our Research Services for additional support—our team will follow up with feasibility details and next steps.
