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Vertebrates express two distinct families of SUMO proteins (SUMO1 and SUMO2/3) that serve distinct functions as posttranslational modifiers. Many proteins are modified specifically with SUMO1 or SUMO2/3, but the mechanisms for paralog selectivity are poorly understood. In a screen for SUMO2/3 binding proteins, we identified Ubiquitin Specific Protease 25 (USP25). USP25 turned out to also be a target...