Direct projection of the neurons expressing neurokinin B receptor(NKR) from the hypothalamus to the nucleus of the solitary tract(NTS) was carried out in the rat by using fluorescence immunohistochemistry combined with fluorogold(FG) retrograde tracing technique.After injection of FG into the NTS,FG labeled neurons were seen in the dorsal hypothalamic area,paraventricular nucleus,perifornical area,dorsal and ventrolateral parts of the lateral hypothalamic area.On the other hand,NKR positive neurons were mai...