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PCA and Hierarchical Clustering of Protein MS Data. Overview of proteomic data as obtained from protein 2D‐LC‐MS/MS analysis on extracts of Arabidopsis thaliana senescing leaf samples during the four stages of senescence. a, c: Principal component analysis (PCA) of the samples, normalized to total protein (a) or leaf area (c). b, d: Hierarchical clustering of the proteins detected, based on equal protein loading (b) or normalized to leaf area (d)
