FGF-9 plays a critical role in neuronal survival, lung development, and mesenchymal cell proliferation, making it a key target in both developmental biology and regenerative medicine research. This recombinant mouse Fgf9 covers the full-length sequence (aa 1–208) with an N-terminal 6xHis tag and demonstrates strong mitogenic potency, with an ED50 of 4.14 ng/ml in a Balb/3T3 fibroblast proliferation assay — a level of activity that supports use in cell proliferation and survival assays, neuronal or osteogenic differentiation studies, and angiogenesis or wound healing models. Expressed in *E. coli*, this protein is free of mammalian-derived glycosylation artifacts, providing a suitable basis for receptor-ligand binding and competition assays via SPR or ELISA where consistent post-translational uniformity matters. Purity exceeding 95% by SDS-PAGE combined with endotoxin levels below 1.0 EU/μg satisfies the criteria typical for cell-based functional assays and *in vivo* tumor biology or regenerative medicine studies.
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