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Western blot image of recombinant his-tagged human SK1 protein. Blots were probed with rabbit polyclonals anti-SK1 (Central Region) (SP1621) at 1:1000 (lane 1) and 1:4000 (lane 2), and anti-SK1 (C-terminal region) (SP5421) at 1:1000 (lane 3) and 1:4000 (lane 4).