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Preparation of Arabidopsis nucleoli and classification of proteins identified by mass spectrometry. (A) Nucleoli were purified from protoplasts and visualized using phase contrast light microscopy. Left: purified protoplasts (bar, 10 μm); center: purified nuclei (bar, 5 μm); right: purified nucleoli (bar, 2 μm). (B) Distribution of identified proteins among different protein classes
