1ILD:
reference: Structural investigations of the active-site mutant Asn156Ala of outer membrane phospholipase A: function of the Asn-His interaction in the catalytic triad., Snijder HJ, Van Eerde JH, Kingma RL, Kalk KH, Dekker N, Egmond MR, Dijkstra BW, Protein Sci 2001 Oct;10(10):1962-9. PMID: 11567087

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