In Bacillus subtilis, threonine is metabolized by the following sequence of reactions: (a) oxidation; (b) decarboxylation; (c) transamination; and (d) oxidation to produce pyruvate. Outline this sequence of steps, show the structures of the substances, use abbreviations for the cofactors, and show any enzyme-bound coenzymes.    What type of enzyme bound intermediate is likely for reaction (d)?

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