Human and murine analogs of DUBs, hematopoietic-specific, cytokine-inducible deubiquitinating proteases, clustered on chromosome 7 and and their respective regulatory regions are identified. The nucleotide or proteins encoded thereby may be used in assays to identify inhibitors of hDUB7, human deubiquitinating enzyme, or mDUB7, mouse deubiquitinating enzyme. The invention also includes transducing peptides comprising an NLS, nuclear localization signal, or transducing sequence of hDUB7 or mDUB7 linked to a cargo molecule, and methods of delivering a biologically active protein, therapeutically effective compound, antisense nucleotide, or test compound to a cell wherein a transducing peptide is added exogenously to a cell.