2.6.1.5 adrenaline activation is independent of the concentration of tyrosine, maximal activation achieved with 7-10 micromolar of adrenaline 640113 2.6.1.5 dexamethasone - 674229 2.6.1.5 dexamethasone dexamethasone (5 mg) induces a significant increase in TAT activity, a further increase in TAT activity is not observed in the hepatocytes from the deficient rats, in contrast to the cells from the controls, when glucagon is added simultaneously with dexamethasone 702947 2.6.1.5 dopamine slight activation 640113 2.6.1.5 metanephrine slight activation 640113 2.6.1.5 noradrenaline slight activation 640113