Sharma AD, Cantz T, Richter R, Eckert K, Henschler R, Wilkens L, Jochheim-Richter A, Arseniev L, Ott M. Human Cord Blood Stem Cells Generate Human Cytokeratin 18-Negative Hepatocyte-Like Cells in Injured Mouse Liver. The American Journal of Pathology. 2005 Aug;167(2):555–64. doi: 10.1016/s0002-9440(10)62997-5.