A protein complex that possesses protein serine/threonine kinase activity, and contains two catalytic alpha subunits and two regulatory beta subunits. Protein kinase CK2 complexes are found in nearly every subcellular compartment, and can phosphorylate many protein substrates in addition to casein. (Gene Ontology, GO_0005956)
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1 proteins localized to the protein kinase ck2 complex cellular component from the COMPARTMENTS Curated Protein Localization Evidence Scores dataset.