substances from urinary extracts of normal , nonpregnant subjects and human pituitary gonadotropin preparations were found to react similarly to human chorionic gonadotropin ( hcg ) in a radioimmunoassay system that is highly specific for hcg and without crossreactivity to human luteinizing hormone ( hlh ) .
C0018066
pituitary gonadotropin preparations
C0023607
luteinizing hormone