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Nrk is not expressed in reproductive tissues other than placenta. Immunoblot analysis of Nrk protein with anti-Nrk antibody in the lysates of WT and Nrk-null mouse reproductive tissues at 18.5 dpc (top) is shown. The lysates were also blotted with anti-α-tubulin antibody (bottom). Open arrowheads and asterisks indicate Nrk and nonspecific bands, respectively.
