Interferon alpha-2 drives antiviral defense and immunomodulation through JAK/STAT signaling, making verified potency essential for meaningful functional studies. This tag-free recombinant human IFNA2 (aa 24–188) delivers a specific activity of no less than 1.0 × 10⁸ IU/mg in anti-viral assays, confirming robust signaling potency suitable for cell-based activation assays, JAK/STAT pathway dissection, and use as a reference standard in cytokine detection platforms. The endotoxin level of less than 1.0 EU/μg eliminates LPS-driven artifacts that commonly confound immune cell experiments such as PBMC stimulation, dendritic cell differentiation, and in vivo models of infection or tumor biology. Purity exceeding 96% by SDS-PAGE, combined with faithful representation of the mature protein sequence expressed in *E. coli*, supports use in antibody development workflows including immunization, ELISA coating, and Western blot controls.
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