Thyrotropin bTSH White to off-white lyophilized solid. Native thyroid stimulating hormone from bovine pituitary. Glycoprotein hormone that exerts mild, continuous stimulation on the thyroid, resulting in maintenance of activity. Its secretion is inhibited by Somatostatin (Cat. No. 05-23-0850). Biological activity: ≥0.7 IU/mg solid as measured against the WHO standard or equivalent.. One International Unit (IU) is defined as the activity in 20 mg of the labeled preparation of the USP reference substance. RTECS XP3581600, CAS 9002-71-5. Merck Index: 14, 9414 Ref.: Franci, C.R., et al. 1992. Proc. Natl. Acad. Sci. USA 89, 11391. Gartner, R. 1992. Exp. Clin. Endocrinol. 100, 32. Raspe, E., et al. 1991. Mol. Cell. Endocrinol. 81, 175. |