title: Development of the conduction system of the human embryonic and foetal heart. Differentiation of the sinoartial node.
mesh_terms: D002454:Cell Differentiation; D005318:Fetal Heart / Q000033:anatomy & histology; D005333:Fetus / Q000033:anatomy & histology*; D006801:Humans; D012849:Sinoatrial Node / Q000196:embryology* / Q000648:ultrastructure