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merCremer activates the cell cycle in CMs. (A-C) The effect of tamoxifen-activated merCremer on numbers of CMs exhibiting cell-cycle activation, as indicated by the nuclear presence of Ki67 (A), BrdU (B) and pH3 (C). (D) A typical example of a Ki67-positive CM nucleus (arrow). n=3 hearts per time point; *P<0.05 versus +/+.
