4UWW:
reference: Structure of struthiocalcin-1, an intramineral protein from Struthio camelus eggshell, in two crystal forms., Ruiz-Arellano RR, Medrano FJ, Moreno A, Romero A, Acta Crystallogr D Biol Crystallogr. 2015 Apr;71(Pt 4):809-18. doi:, 10.1107/S139900471500125X. Epub 2015 Mar 26. PMID: 25849392

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