2SKD:
reference: Activator anion binding site in pyridoxal phosphorylase b: the binding of phosphite, phosphate, and fluorophosphate in the crystal., Oikonomakos NG, Zographos SE, Tsitsanou KE, Johnson LN, Acharya KR, Protein Sci 1996 Dec;5(12):2416-28. PMID: 8976550

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