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Model for the function of Yar1. Newly translated Rps3 is bound by Yar1, which shields the positive charges of Rps3 (symbolized in red). After translocation of Yar1 and Rps3 into the nucleus the Yar1-Rps3 complex is disassembled and Rps3 joins pre-ribosomal particles. After its dissociation from Rps3, Yar1 is exported back into the cytoplasm.
