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Fig. 1. Structural features and potential phosphorylation sites in protein B23.1. (A) The CK2 site lies in the first acidic region. The potential CDK1 sites (arrowheads) are located in or near the nucleic acid binding region. Other functional segments are indicated below the diagram. (B) CK2 (Ser125) and potential CDK1 (Thr199, 219, 234 and 237) sites of phosphorylation on protein B23.1 are shown in bold.