as compared to the beta-subunits of the pituitary gonadotropin hormones , lutropin , follitropin , and thyrotropin , ecg beta possesses a glycosylated cooh-terminal extension of about 30 amino acid residues , as does the human chorionic gonadotropin beta-subunit ( hcg beta ) .
C0018066
pituitary
C0023607
lutropin