Comparative study of the neuronal phosphorylation in TgKO and WT mice. Sagittal sections of the brainstem region from the TgKO mouse embryo (A) and the WT mouse embryo (B) at E18.5, stained with phospho-epitope-specific monoclonal antibody (SMI-31). Note the resemblance between the TgKO (A) and the WT (B) mouse, showing similar axonal staining. Scale bar, 1 mm.