English: A cartoon of the relevant residues making up the active site in relation to PLP and the product, L-lysine. The residues in light blue (tyrosine, arginine, lysine, and histidine) belong to one monomer, while the residues in light green (cysteine, glutamic acid, and serine). Lysine forms a Schiff base with PLP, while histidine stabilizes the formation.
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