Kumar, M and Bagchi, B and Gupta, SK and Meena, AS and Gressens, P and Mani, S (2007) Neurospheres derived from human embryoid bodies treated with retinoic Acid show an increase in nestin and ngn2 expression that correlates with the proportion of tyrosine hydroxylase-positive cells. Stem Cells Dev, 16 (4). pp. 667-681.