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Upper Market has a new sushi spot: Signature Sushi has set up shop in the basement of Rebel, where they're offering rolls, nigiri, yakitori, and the typical lineup of tempura, gyoza, edamame, and other appetizers. It's intended to be a to-go-only operation, but Yelpers have had success asking to sit down and enjoy their meals inside Rebel, which also offers a full bar. [EaterWire]