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Fig. 6. Lhx1 and Lhx5 regulate late aspects of development in
Pax2 inhibitory interneurons. (A-D) Dorsal horn quadrants showing the
downregulation of Pax2 in dILA neurons. This downregulation begins
at E12.5 in DKO animals (asterisk, B) and is more pronounced at E14.5
(asterisk, D). (E-H)Lmx1b+ dILB neurons are
specified normally and settle in the superficial dorsal horn in DKO
animals at similar stages to wild type. (I-L) VGluT2 is not
upregulated in the superficial dorsal horn (arrows) indicating that GABAergic
Pax2+ cells do not adopt a dILB glutamatergic phenotype
in the DKO cord. (M,N) E17.5 DKO animals
exhibit a loss of Pax2 expression both dorsally and ventrally at E17.5.
(O) Cell counts of Pax2+ and Lmx1b+ cells at
E14.5 show a >60% reduction in the number of dorsal Pax2+ cells
without any increase in the number of Lmx1b+ dILB
cells.