IL-7 is a critical homeostatic cytokine that drives T-cell survival, proliferation, and thymic development through JAK1/JAK3–STAT5 signaling, making it a key target in immunology research. This tag-free recombinant human IL-7 encompasses the full mature sequence (residues 26–177) and demonstrates a specific activity exceeding 1.0 × 10⁸ Units/mg in a PHA-activated human PBMC proliferation assay, providing the signaling potency needed for T-cell and B-cell proliferation assays, STAT5 phosphorylation studies, and anti-apoptotic signaling experiments. Endotoxin levels below 1.0 EU/μg minimize LPS-driven artifacts that can confound immune cell functional readouts, which supports use in sensitive applications such as in vivo inflammation or tumor biology models, antibody validation workflows, and as a reference standard in cytokine detection assays. Purity above 97% by SDS-PAGE, combined with this stringent endotoxin control, satisfies the quality thresholds commonly required for quantitative cell-based and in vivo studies.
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