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Figure S3.  Characterization of the MKP-1 KO mice. (A) Southern blot of murine embryonic fibroblasts from MKP-1^−/+ or MKP-1^−/− mice with a probe for MKP-1. (B) Western blot of liver lysates from MKP-1^-/+ or MKP-1^−/− mice with antibody to MKP-1 or HuR.