compared with those in the rat , sheep serotonergic structures exhibit striking specific characteristics : ( 1 ) greater scattering of cell bodies within the different groups visualized , ( 2 ) absence of group b4 and hypothalamic groups , ( 3 ) only a weak serotonergic innervation of the suprachiasmatic nuclei area .
C0020663
hypothalamic
C0038866
suprachiasmatic nuclei