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Urokinase-type plasminogen activator(uPA) is a potential therapeutic target for cancerXREFX.1 Very recently,we reported a cyclic peptide-based inhibitor(IG-2,CPAYSRYIGC) of murine uPA with high potency and specificity(Ki=6.8 nM).2-3 However,the potency of IG-2 against human uPA(huPA) was much weaker(Ki=340 nM),hindering the clinical translation of peptide-based uPA targeting strategy.