part of sinoatrial node cell differentiation cardiac pacemaker cell fate commitment sinoatrial node cell fate commitment The commitment of cells to sinoatrial (SA) node cell fates and their capacity to differentiate into SA node cells. SA node cells are pacemaker cells that are found in the sinoatrial node. SA node cell commitment SAN cell commitment 2009-09-29T12:03:38Z dph biological_process GO:0060930 sinus node cell commitment