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Wild-type (A, E), Y504F (B), Y497F (C) and Y497/504F (D) murine FRK/RAK is shown. In (F), the phosphopeptide map of in vitro phosphorylated VDNEDIYESKHEIKKK peptide is shown, of which one position is identical with that of the wild-type FRK/RAK pattern. (E) is identical with (A), except that the experiment was performed at a different time.
