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Summary of data from large-scale phosphopeptide identification and quantitation. A, scatter plot. The x axis represents the log 2 ratio (L/H) value, the y axis represents the log10 ion intensity value. A log 2 value of +1 or −1 represents a 2-fold alteration in phosphorylation. B, distribution of phospho-serine, threonine, and tyrosine sites among detected phosphopeptides. C, biological functional groups of identified phosphoproteins.
