6FXB:
reference: Revealing the Dimeric Crystal and Solution Structure of beta-Lactoglobulin at pH 4 and Its pH and Salt Dependent Monomer-Dimer Equilibrium., Khan S, Ipsen R, Almdal K, Svensson B, Harris P, Biomacromolecules. 2018 May 15. doi: 10.1021/acs.biomac.8b00471. PMID: 29737841

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