at the end of the 10th week , five animals in each group were challenged with either human chorionic gonadotropin ( hcg , 50 iu/animal , iv ) or gonadotropin-releasing hormone ( gnrh , 100 ng/animal , iv ) , and the testosterone or gonadotropin responses were monitored over time .
C0018062
human chorionic gonadotropin
C0018061
gonadotropin