Biological characteristics and optimal strategy of human amniotic fluid-derived mesenchymal stem cells cultured in vitro   
Wang Pei-pei1, Zheng Yu-bao1, Peng Liang1, Yu Jun2, Gao Zhi-liang1
Chinese Journal of Tissue Engineering Research . 2012, (10): 1780 -1785 .  DOI: 10.3969/j.issn.1673-8225.2012.10.016