The process in which a relatively unspecialized cell acquires the specialized structural and/or functional features of an endocardial cell. An endocardial cell is a specialized endothelial cell that makes up the endocardium portion of the heart. The endocardium is the innermost layer of tissue of the heart, and lines the heart chambers. [GOC:mtg_heart]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process