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Tissue distribution of plasma membrane proteins detected by mass spectrometry. The distribution (%) of proteins among plasma membranes from leaves (green), xylem (red), and cambium/phloem (blue) is shown. Only the 956 proteins classified as top rank are included. These are further divided into 213 integral membrane proteins, i.e. proteins predicted to have one or more transmembrane domain using the program Phobius (38), and 743 soluble proteins.
