41. Among the essential amino acids, which one is a precursor for the neurotransmitter serotonin?
(A) Tryptophan
(B) Threonine
(C) Valine
(D) Isoleucine

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統計: A(5), B(0), C(0), D(1), E(0) #3331935

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#7252746
這是一道關於生物化學(Biochemis...
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#6387307
Among the essential...
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