Differentiation of mesencephalic neural stem cells induced by glial cell line-derived neurotrophic factor and interleukin-1 beta in vitro  
Ding Ji-gu, Ding Wen-jie, Li Guang
Chinese Journal of Tissue Engineering Research . 2010, (27): 5033 -5036 .  DOI: 10.3969/j.issn.1673-8225.2010.27.021