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That is, electron withdrawal toward the cationic nitrogen atom of the imine and into the electron sink of the pyridoxal ring from the alpha carbon atom of the attached amino acid activates all three of the substituents of this carbon for reactions which require electron withdrawal from this atom." When PLP-dependent enzymes react with an external amino acid as a substrate, the amine of the incoming amino acid replaces the amine on the enzyme's active Lys to form an external imine

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