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. 1998 Sep 21;142(6):1559–1569. doi: 10.1083/jcb.142.6.1559

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Sequence alignment of Xenopus Chk1 (Xchk1), human Chk1, Drosophila Grapes, and S. pombe Chk1. Sequences were aligned using the Prettyplot program. Identical residues are boxed. Asterisk, conserved asparagine (N135) residue that is required for kinase activity; underline, sequences that were used to design degenerate PCR primers. These sequence data are available from GenBank/EMBL/DDBJ under accession number AF053120.