endocardial cushion cell
http://purl.obolibrary.org/obo/CL_0008022
A mesenchymal cell of the endocardial cushion. These cells develop via an epithelial to mesenchymal transition when endocardial cells break cell-to-cell contacts and migrate into the cardiac jelly. Cells from this population form the heart septa and valves. [ http://www.ncbi.nlm.nih.gov/pubmed/18816864 ]