5YF9:
reference: Crystal structures of human CK2alpha2 in new crystal forms arising from a subtle difference in salt concentration., Tsuyuguchi M, Nakaniwa T, Kinoshita T, Acta Crystallogr F Struct Biol Commun. 2018 May 1;74(Pt 5):288-293. doi:, 10.1107/S2053230X18005204. Epub 2018 Apr 16. PMID: 29717996

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