(A) Representative images of pig dissociated CMs from P0 to 6mo showing nucleation by DAPI staining (blue), with CMs identified by sarcomeric α-actinin (green). (B) Percentage of total CMs exhibiting mono-, bi-, and multi-nucleation per stage calculated by manual nucleation counts. (C) Representative images of multinucleated CMs (red arrows), via WGA staining in longitudinal sections of pig left ventricular tissue. Data are mean ± SEM, with p<0.05 determined by Dunn’s Kruskal-Wallis Multiple Comparisons Test in n=4–5 pigs per stage.