to determine the etiology of male hypogonadism in a newly found mutant rat ( hgn/hgn , with a single autosomal recessive trait ) , concentrations of testosterone , luteinizing hormone ( lh ) , and follicle-stimulating hormone ( fsh ) were measured , and the responsiveness of the urogenital organs , hypothalamus , and pituitary gland to testosterone ( 1 mg/kg s.c. for 7 days ) , fsh ( 0.3 au/kg s.c. for 7 days ) , human chorionic gonadotropin ( hcg ) ( 40 iu/kg s.c. for 7 days ) , and luteinizing hormone-releasing hormone ( lhrh ) ( 0.5 or 5.0 micrograms/kg s.c. for 7 days ) were tested .
C0020663
hypothalamus
C0023610
luteinizing hormone-releasing hormone