Formation of the endocardium of the heart. The endocardium is an anatomical structure comprised of an endothelium and an extracellular matrix that forms the innermost layer of tissue of the heart, and lines the heart chambers. [ GOC:bf http://www.ncbi.nlm.nih.gov/pubmed/17722983 GOC:dph ]
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- anatomical structure formation involved in morphogenesis and results in formation of some endocardium