5JDU:
reference: Loop Electrostatics Asymmetry Modulates the Preexisting Conformational Equilibrium in Thrombin., Pozzi N, Zerbetto M, Acquasaliente L, Tescari S, Frezzato D, Polimeno A, Gohara DW, Di Cera E, De Filippis V, Biochemistry. 2016 Jul 6. PMID: 27347732

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