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FX1-5303 is a **highly potent and specific inhibitor** of ubiquitin-specific protease 7 (**USP7**), a member of the deubiquitinase (DUB) enzyme family. It demonstrates a biochemical IC50 of 0.29 nM, indicating strong activity against its target. USP7 is a key regulator of protein degradation pathways relevant to cancer and other cellular processes, and its inhibition is an active area of research in oncology and immunology[1].
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