SA node cell to atrial cardiac muscle cell signaling SA node cardiac muscle cell to atrial cardiac muscle cell signalling SA node cardiomyocyte to atrial cardiomyocyte signalling sinus node cardiomyocyte to atrial cardiomyocyte signalling 2011-11-10T09:15:01Z GO:0086018 biological_process SAN cardiomyocyte to atrial cardiomyocyte signalling Any process that mediates the transfer of information from an SA node cardiomyocyte to an atrial cardiomyocyte. sinoatrial node cardiomyocyte to atrial cardiomyocyte signalling cell-cell signaling involved in cardiac conduction SA node cell to atrial cardiac muscle cell communication