Mammalian Myocardial Cells11This research was supported in part by USPHS Research Grants NS-09524 from the National Institute of Neurologic Diseases and Stroke and CA-12067 from the National Cancer Institute. It has also benefited from USPHS Training Grant 5-T01-DE-00241–04 from the National Institute of Dental Research. I am pleased to acknowledge the technical assistance of Cindy Arey, Sylvia S. El Kadi, Ann Matthews, James Rodriguez, and Fredy Strasser.