Melatonin secretion from organ-cultured pineal glands of rats: Modulation by gonadectomy and gonadotropin-releasing hormone agonist administration. - Ishizuka,B.; Fusama,S.; Hirai,K.; Hosaka,T.; Hamada,N.; Amemiya,A.; Itoh,M.T. (Eur J Endocrinol, 2000)