retinohypothalamic projections ( rht ) were studied by two anterograde tracing methods , and hypothalamic organization was investigated immunohistochemically with antisera against a number of substances known to be present in the mammalian suprachiasmatic nucleus ( scn ) : bombesin ( bbs ) , glutamic acid decarboxylase ( gad ) , 5-hydroxytryptamine ( 5ht ) , neuropeptide y ( npy ) , neurotensin ( nt ) , somatostatin ( ss ) , substance p ( sp ) , vasoactive intestinal polypeptide ( vip ) , and arginine vasopressin ( avp ) .
C0020663
hypothalamic
C0037659
somatostatin