<正>MicroRNA in neural stem cell development Yue Feng, Anthony Lau, Jian Han, Qun - ying Yang, Chiung - mei Lu (Department of Pharmacology, Emory University, 5029 Rollins Research Center, 1510 Clifton Road, Atlanta 30322, USA; Genaco Biomedical Products, yfeng@ emory. edu) MicroRNAs (miRNAs) are an evolutionarily conserved novel class of small non -coding RNAs, which functions in gene silencing by repressing protein synthesis from their mRNA target that harbor incomplete sequence complementarity. More than 300 miRNAs are encoded by the human genome. The expression levels of many miRNAs are vigorously regulated during normal development in a variety of tissue types especially during stem cell differentiation. Moreover, an increasing numbers of examples have been reported demonstra-