They are mainly in the dorsomedial hypothalamic nucleus and around fornix of hypothalamus. The relative optical density（ROD） of orexin A was larger in the nicotine-exposed neonates than that in the saline neonates（P＜0.05）.
模型組下丘腦orexin A的相對(duì)光密度值高於對(duì)照組,差別有統(tǒng)計(jì)學(xué)意義(P＜0.05)。