A 43-year-old m an recently diagnosed w ith pheochrom ocytom a (an adrenal gland tum or) started a..

A 43-year-old m an recently diagnosed w ith pheochrom ocytom a (an adrenal gland tum or) started a treatm ent w ith a drug that can cause a pronounced decrease in norepinephrine and epinephrine by blocking the rst rate-lim iting step in catecholam ine biosynthesis. Which of the follow ing enzym es was m ost likely inhibited by the drug? A. Arom atic l-am ino acid decarboxylase B. Dopam ine-ß-hydroxylase C. Tyrosine hydroxylase D. Phenylethanolam ine m ethyltransferase E. Monoam ine oxidase

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