Figure 1.

Activation of β-galactosidase and Dicer activity in the ventral spinal cord by Olig1^Cre driver mouse line. A, B, Spinal cord sections from E11.5 and E13.5 Olig1^Cre/R26R:LacZ embryos were subjected to LacZ histochemical staining. Asterisks indicate the positions of motor neurons in the ventral spinal cord. The inset in A represents the LacZ+/HB9+ motor neurons in the ventral horn as detected by double immunofluorescence. C, D, Spinal cord sections from E11.5 Olig1^Cre/+/Dicer-1^flox/flox embryos were examined for miR-9 expression by in situ hybridization.