阿摩線上測驗
23. Which of the following amino acids is the crucial precursor for the biosynthesis of melatonin?
(A) Phenylalanine
(B) Methionine
(C) Lysine
(D) Tryptophan
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統計： A(5), B(4), C(1), D(145), E(0) #2053759
統計： A(5), B(4), C(1), D(145), E(0) #2053759
