the presence of two endogenous forms of gonadotrophin-releasing hormone ( gnrh ) in the chicken hypothalamus ( chicken gnrh-i ( [ gln8 ] gnrh ) and chicken gnrh-ii ( [ his5 , trp7 , tyr8 ] gnrh ) ) , and the stimulation of gonadotrophins by both forms , suggests the possible existence of gnrh receptor subtypes and gonadotroph subtypes in the chicken pituitary .
C0020663
hypothalamus
C1531431
gnrh-ii