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What does TA4 stand for?

TA4 stands for 3,5,3',5'-tetraiodothyroacetic acid


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Uptake of 3,3',5,5'-tetraiodothyroacetic acid and 3,3',5'-triiodothyronine in cultured rat anterior pituitary cells and their effects on thyrotropin secretion. Everts ME, Visser TJ, Moerings EP, et al.
Additionally, both T4 and T3 activated mitogen-activated protein kinase (MAPK) activity, and led, among other events, to phosphorylation of TRß (201). Using a chick chorioallantoic membrane (CAM) system, Davis et al. showed that both T4 and T3 stimulated angiogenesis (201). Since integrin a-Vß-3 is involved in angiogenesis, T4 and T3 binding to it was examined, and T4 was found to bind to integrin a-Vß-3 with high affinity. Tetraiodothyroacetic acid.
48. Pittman CS, Shimizu T, Burger A, Chambers JB Jr. : The nondeiodinative pathways of thyroxine metabolism: 3,5,3′,5′-tetraiodothyroacetic acid turnover in normal and fasting human subjects. J Clin Endocrinol Metab 50:712-716, 1980.