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Stereo views of the crystal structures of (a) Chk2 (green) in complex with PV1352 (gray), (b) superimposed coordinates of Chk2-PV1352 complex (green) with Chk1-ABO complex (orange), (c) Chk2-PV1162 (gray) complex, and (d) superimposed coordinates of Chk2-PV1162 and Chk1-ABO complexes.