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Development of an in vitro protein kinase assay for DMPK. Peptides were tested for phosphorylation by HA-DMPK E as described in Materials and Methods. The extent of phosphorylation of each peptide is expressed as the percentage relative to KKRNRRLSVA (peptide 2). The serine or threonine phosphoacceptor (position 0) is shown in boldface type. Bars indicate standard errors. For comparison, peptides are assembled in two groups (A and B).
