Variation in the thyrotropic activity of human chorionic gonadotropin in Chinese hamster ovary cells arises from differential expression of the human thyrotropin receptor and microheterogeneity of the hormone. - Hoermann,R.; Poertl,S.; Liss,I.; Amir,S.M.; Mann,K. (J Clin Endocrinol Metab, 1995)