15.Melanin is the pigment of the hair, skin and iris of the eyes and is synthesized' in melanocytes. Which of
the following amino acids is the precursor of melanin synthesis?
(A) Arginine
(B) Glycine
(C) Histidine
(D) Tryptophan
(E) Tyrosine
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這是一道關於生物化學與生理學的典型考題，...
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Melanin is the pigme...
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