| Code | CSB-AP001881HU |
| Abbreviation | Recombinant Human IL21 protein (Active) |
| MSDS | |
| Size | $354 |
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IL-21 drives pleiotropic effects on T cell expansion, B cell differentiation, and NK cell activation through JAK1/JAK3–STAT3 signaling, making precise functional reconstitution of this cytokine essential for mechanistic immunology studies. This tag-free recombinant human IL-21 encompasses the full mature sequence (residues 23–155) and demonstrates an ED50 below 20 ng/mL in N1186 T cell proliferation assays, corresponding to a specific activity exceeding 5.0 × 10⁴ IU/mg—performance that supports use in T and B cell activation assays, JAK/STAT pathway dissection, and as a reference standard in cytokine detection platforms. Endotoxin levels below 1.0 EU/μg eliminate LPS-driven artifacts that confound immune cell readouts, satisfying the criteria typical for in vivo tumor biology models and primary lymphocyte differentiation experiments. Purity exceeding 97% by SDS-PAGE further provides a suitable basis for antibody development workflows including immunization, ELISA coating, and functional blocking studies.
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