The process that results in the delineation of a specific region of the lateral mesoderm into the area which will form the majority of the mesodermal component of the right ventricle, arterial pole (outflow tract) and venous pole (inflow tract). [GOC:mtg_heart, GOC:rl, PMID:17276708]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process