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Fig. 1. Reduced and delayed Olig2 expression in Nkx6.1 mutant
spinal cord at the thoracic region. Transverse spinal cord sections from E12.0
(A,B), E13.5 (C,D), E15.5 (E,F), E17.5 (G,H) and P0 (I,J) wild-type
(A,C,E,G,I) and Nkx6.1 (B,D,F,H,J) mutants embryos were subjected to
in situ hybridization with riboprobe for Olig2. In Nkx6.1
mutants, the early expression of Olig2 in the ventral ventricular
zone is markedly reduced and asymmetrically displayed, and the generation of
Olig2+ OPC cells is dramatically delayed and reduced.