1DZ8:
reference: The catalytic pathway of cytochrome p450cam at atomic resolution., Schlichting I, Berendzen J, Chu K, Stock AM, Maves SA, Benson DE, Sweet RM, Ringe D, Petsko GA, Sligar SG, Science 2000 Mar 3;287(5458):1615-22. PMID: 10698731

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