Development of internodal connections of the conduction system of the human heart.
D002454:Cell Differentiation; D005318:Fetal Heart / Q000166:cytology* / Q000201:enzymology; D006321:Heart / Q000196:embryology*; D006329:Heart Conduction System / Q000166:cytology / Q000196:embryology* / Q000201:enzymology; D006801:Humans