Differentiation of human placenta-derived mesenchymal stem cells into cholinergic neuron-like cells in vitro 
Jing Xu-dong, He Dong-mei, Zhang Yuan, Chen Li
Chinese Journal of Tissue Engineering Research . 2010, (32): 5949 -5951 .  DOI: 10.3969/j.issn.1673-8225.2010.32.013