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A. Overlap between phosphopeptide enrichment methods on the level of identified unique phosphopeptides in the M-4A4 or NM-2C5 cell lines. Around 50% of the unique phosphopeptides identified from the TiO2 method were also identified in the ZrO2 method; B. Distribution of singly (1), doubly (2), triply (3) and quadruply (4) phosphorylated peptides enriched by TiO2 or ZrO2 in the two cell lines.
