4BF7:
reference: The binding of zinc ions to Emericella nidulans endo-beta-1,4-galactanase is essential for crystal formation., Otten H, Michalak M, Mikkelsen JD, Larsen S, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013 Aug;69(Pt 8):850-4. doi:, 10.1107/S1744309113019714. Epub 2013 Jul 27. PMID: 23908026

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