- CD117-positive cells and mast cells in adult human cardiac valves--observations and implications for the creation of bioengineered grafts. Veinot, J.P., Prichett-Pejic, W., Song, J., Waghray, G., Parks, W., Mesana, T.G., Ruel, M. Cardiovascular pathology : the official journal of the Society for Cardiovascular Pathology. (2006)