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Requirement of NGN1 and NGN2 for DRG development. Transverse sections through an E15 ngn1 and ngn2 double homozygous embryo (B,D) and a wild-type control embryo (A,C) at lumbar level were probed with SCG10, a pan neuronal marker. DRG (A, DRG) were absent in double mutants (B). Expression of SCG10 in sympathetic ganglia (C and D, Sym.) was not affected.
