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Expression of skeletal muscle differentiation factors in p21−/− p57−m/+ double mutants. (A,B) myogenin expression detected with in situ hybridization on transverse sections of E18.5 embryos. (C) A Western blot of hind limb muscle extracts probed with a monoclonal antibody against myogenin. (D,E) MEF2C expression detected by in situ hybridization on transverse sections of E18.5 embryos.
