d, Immunostaining of heart sections for PCNA and MEF2 in 5 dpci animals treated with PBS, 2-DG or DCA; magnified view of area in white boxes shown below; white dashed lines mark the wound border; arrowheads point to PCNA+ CMs; percentage of PCNA+ CMs in the border zone shown on the right (n = 4-5 ventricles). 