Differentiation efficiency of human umbilical cord mesenchymal stem cells into hepatocytes under two kinds of liver homogenate supernatants: a comparative study 
Yan Cheng, Xue Gai, Wu Li-ying, Liu Jian-fang, Hou Yan-ning
Chinese Journal of Tissue Engineering Research . 2015, (19): 2993 -2998 .  DOI: 10.3969/j.issn.2095-4344.2015.19.007