13. Lipoate is one of the cofactors of the pyruvate dehydrogenase complex. It can undergo reversible oxidation with its two:
(A) thiol groups.
(B) amino groups.
(C) hydroxyl groups.
(D) amide groups.
(E) carboxyl groups.

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統計： A(2), B(0), C(0), D(0), E(0) #2789007