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. 2004 May;24(9):3703–3711. doi: 10.1128/MCB.24.9.3703-3711.2004

FIG. 6.

FIG. 6.

Ser125 is the NPM ATR phosphorylation site. (A) NPM GST deletion mutants were constructed as described in Materials and Methods and phosphorylated by ATR in vitro. Mutation of Ser125 to alanine (lane 8) completely abolishes phosphorylation by ATR. (B) SDS-polyacrylamide gel electrophoresis of all the recombinant proteins used in the kinase assay (A).