1KZM:
reference: Structural analysis of the two horseradish peroxidase catalytic residue variants H42E and R38S/H42E: implications for the catalytic cycle., Meno K, Jennings S, Smith AT, Henriksen A, Gajhede M, Acta Crystallogr D Biol Crystallogr 2002 Oct;58(Pt 10 Pt 2):1803-12. PMID: 12351824

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