A nuclear localization signal binding protein in the nucleolus.

We used useful wild-type and mutant artificial nuclear localization sign peptides of SV-40 T antigen cross-linked to human serum albumin (peptide conjugates) to assay their binding to proteins of rat liver nuclei on Western blots. Proteins of 140 and 55 kD (p140 and p55) had been solely acknowledged by wild-type peptide conjugates. Free wild-type peptides

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