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Fig. 6. Nkx2.2 mutation does not affect spinal cord expression of neuregulin 1 (Nrg1). Nrg1 is primarily expressed in motor neurons in the ventral spinal cord at E10.5 (A), E13.5 (C) and E14.5 (B). There is no discernible difference in the expression of Nrg1 between wild type and mutants at E13.5 (C,D) and E17.5 (not shown).