Assertion: circulatory system's cell | /r/AtLocation | right atrium
Facets:
value: near the junction
type: LOCATION
value: with the venae cavae
type: OTHER
Source sentences:
text: The pacemaker in mammals (and also in birds) is an oblong mass of specialized cells called the sinoatrial node, located in the right atrium near the junction with the venae cavae.