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Fig. 4. Effect of the Mash1 mutation on the generation of dILA
neurons. Dorsal neurons in control,
Mash1/ and
Mash1Ngn2/Mash1Ngn2 embryos were analyzed at
E12.5 using immunohistochemistry, with antibodies directed against
(A-F) Lhx1/5 (green) and Tlx3 (red), (H-J) Pax2 (green) and
Lmx1b (red). dILA neurons express Lhx1/5 and Pax2, and dILB neurons express
Tlx3 and Lmx1b. (G,K) Numbers of BrdU+ dILA (dark-grey columns)
and BrdU+ dILB (light grey columns) neurons in control (c),
Mash1/ (/) and
Mash1Ngn2/Mash1Ngn2 (N2/N2) mutant mice, as
assessed 24 hours after BrdU injection. The number of dILA neurons is reduced
in Mash1/ embryos. (L-N) Analysis of
Ptf1a (green) and Mash1 (red) expression in the dorsal spinal cord of control
(L), Mash1/ (M) and
Mash1Ngn2/Mash1Ngn2 (N) embryos. (O)
Numbers of Ptf1a+ cells (black columns) in control (c),
Mash1/ (/) and
Mash1Ngn2/Mash1Ngn2 (N2/N2) mutant mice. The
error bars represent the standard deviation. (P-R) In situ
hybridization of sections from E12.5 control, Mash1/
and Mash1Ngn2/Mash1Ngn2 spinal cords using a
probe directed against Hes5 mRNA. Scale bars: 100 µm in A-C,P-R;
50 µm in D-F,H-J,L-N.