| Code | CSB-MP872537HU-WD2 |
| Abbreviation | Recombinant Human IL21 protein (Active) |
| MSDS | |
| Size | Inquiry |
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Interleukin-21 plays a central role in regulating NK and T cell effector functions, yet recombinant preparations often suffer from endotoxin contamination that confounds immune cell readouts. This mammalian-expressed protein, spanning the full mature sequence (aa 25–162) with C-terminal hFc1 tag, demonstrates potent bioactivity with an ED50 ≤ 20 ng/mL in stimulating IFN-γ secretion from NK-92 cells, providing a quantitative benchmark for dose-response studies in NK cell activation assays and co-culture experiments examining cytotoxic lymphocyte priming. The endotoxin level of ≤10 EU/mg meets the stringent thresholds required for primary human PBMC proliferation assays, T cell differentiation protocols, and JAK/STAT signaling pathway analyses where LPS-driven artifacts would obscure IL-21–specific responses. Purity exceeding 95% by SDS-PAGE, combined with the validated NK cell activity, supports its use as a positive control in cytokine detection platforms and as a defined reagent in antibody development workflows targeting IL-21.
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