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Dorsal raphé nucleus. In (A) histological section of medulla oblongata showing in the framed area the localization of the DRN. In (B) normal structure in a control fetus (39 gestational weeks) with many neurons. In (C) hypoplasia of the DRN with few neurons in an age-matched SIUDS case. Klüver Barrera staining. Magnification (A) 0.5x; (B) and (C) 10x.
