The first recognizable structure derived from the heart field.
Comment:
[homology-note] "(In vertebrates) The embryonic mesoderm is the source of both the cardiogenic plate, giving rise to the future myocardium as well as the endocardium that will line the system on the inner side.[well established][VHOG]" xsd:string {date_retrieved="2012-09-17", external_class="VHOG:0000975", ontology="VHOG", source="PMID:15611355 Gittenberger-de Groot AC, Bartelings MM, Deruiter MC, Poelmann RE, Basics of cardiac development for the understanding of congenital heart malformations. Pediatric Research (2005)", source="http://bgee.unil.ch/"}