Figure 1: Representative pictures from phase contrast and immunofluorescence staining of neonatal rat ventricular cardiomyocytes after 24 h culture.

After 24 h, the cultured cardiomyocytes displayed characteristics of elongated and triangular shape (Phase Contrast). The immunocytochemistry demonstrated that the percentage of cardiomyocytes in our culture system was greater than 95% using a specific cardiomyocytes maker antibody (anti-cTnT) and Hoechst double staining. The experiments were repeated in three independent cultures with similar results.