part of part of in taxon results in development of myocyte of sinoatrial node cell development sinoatrial node cell differentiation cardiac pacemaker cell development sinoatrial node cell development GO:0060931 2009-09-29T12:05:47Z SA node cell development SAN cell development sinus node cell development The process whose specific outcome is the progression of a sinoatrial (SA) node cell over time, from its formation to the mature state. SA node cells are pacemaker cells that are found in the sinoatrial node. dph Vertebrata <vertebrates>