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Chk1-mediated phosphorylation of three C-terminal CK1δ fusion protein sets containing either wild-type or mutant sequences encompassing amino acids 305–375 (A), 353–375 (B), and 375–428 (C) of the rat CK1δ sequence. The GST-CK1δ fusion proteins were phosphorylated by Chk1 in vitro and separated in SDS-PAGE. Substrate phosphorylation was quantified by Cherenkov counting. Results are shown as normalized bar graphs.
