Our Primary Human Cardiac Myocytes (HCM) are isolated from the ventricles of the adult heart. They are qualified for in vitro research on cardiac diseases and for pharmacological studies. Our HCM behave like progenitor cells and are not fully differentiated. They do not spontaneously beat in vitro, but unlike freshly isolated rod-shaped myocytes, our HCM can be cultured for at least 15 population doublings. Therefore, when cultured in our Myocyte Growth Medium, HCM are suitable for long-term experiments like investigating the long-term effects of cytokines, toxicological screenings, or cell-cell interactions.