The reaction catalyzed by isocitrate dehydrogenase is:
\[ \text{Isocitrate} + NAD^+ \rightarrow \alpha\text{-Ketoglutarate} + NADH + CO_2 + H^+ \]
The reaction catalyzed by $\alpha$-ketoglutarate dehydrogenase is:
\[ \alpha\text{-Ketoglutarate} + NAD^+ + CoA
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