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Comparison of transphosphorylation of E. coli proteins for BRI1, BAK1, PEPR1, and CDPKβ. (A) Venn diagram illustrating the overlap in phosphopeptides and (B) phosphoproteins identified as substrates of the four kinases expressed individually in E. coli. (C) Number of phosphosites per protein that were identified following expression of the protein kinases.
