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An abundant nuclear phosphoprotein, the La autoantigen, is the first protein to bind all newly synthesized RNA polymerase III transcripts. Binding by the La protein to the 3′ ends of these RNAs stabilizes the nascent transcripts from exonucleolytic degradation. In the yeasts Saccharomyces cerevisiae and Schizosaccharomyces pombe, the La protein is required for the normal pathway of tRNA maturation
