2LVK:
reference: Solution structures of polcalcin Phl p 7 in three ligation states: Apo-, hemi-Mg(2+) -bound, and fully Ca(2+) -bound., Henzl MT, Sirianni AG, Wycoff WG, Tan A, Tanner JJ, Proteins. 2013 Feb;81(2):300-15. doi: 10.1002/prot.24186. Epub 2012 Nov 12. PMID: 23011803

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