Germline Stem Cells. 1  1Howard Hughes Medical Institute Research Laboratories, Department of Embryology, Carnegie Institution, Baltimore, Maryland 21218. 2  2Department of Developmental Biology, Stanford University School of Medicine, Stanford, California 94305-5329.
Heart Squad was founded in 2008, and is located at 575 29th St in Manhattan Beach.
The Sinoatrial Node: The Body's Natural Pacemaker. In the upper part of the right atrium of the heart is a specialized bundle of neurons known as the sinoatrial node (SA node). Acting as the heart's natural pacemaker, the SA node fires at regular intervals to cause the heart of beat with a rhythmn of about 60 to 70 beats per minute for a healthy, resting heart.